Apparel HS Code Classification Guide: How Knit vs. Woven, Fiber Type, and Gender Drive Your Duty Rate

A one-percent change in fabric composition can double the duty rate on an apparel shipment.

Apparel classification is often treated as a paperwork exercise, but small details such as whether a garment is knit or woven, whether polyester outweighs cotton by a single percentage point, or whether a product qualifies as a baby's garment can change the tariff code applied at entry. Those changes affect duty rates, landed costs, and compliance risk.

The challenge is that apparel classification follows a series of rules that are not always obvious from the product description alone. Fiber composition, garment construction, gender designation, and product type all play a role in determining the final HTSUS classification.

Understanding how those decisions are made helps importers identify potential duty rate changes before a shipment reaches customs and avoid some of the classification errors that appear most often during audits.

What Do You Need Before You Classify the First Sample? 

A garment can be classified incorrectly long before it reaches customs. In many cases, the problem is not the tariff code itself but the information used to determine it.

Most apparel reclassification disputes can be traced back to four pieces of missing or inaccurate product data:

• Fiber composition: A 50/50 cotton-polyester blend and a 51/49 blend can fall into different tariff provisions and attract different duty rates. Visual inspection is not enough; classification depends on verified fiber-content data from mill testing or Customs documentation.

• Fabric construction: Knit and woven garments follow different classification paths under the HTSUS. Product photos rarely provide enough detail, making fabric specifications or physical swatches essential.

• Gender and age designation: Intended fit, garment design, and closure direction all influence classification. Products marketed as "unisex" can trigger classification rules that route them into women's headings by default.

• Body height measurements: Small sizing differences matter for infant apparel. Garments designed for children up to 86 cm in body height may qualify for babies' provisions that carry different tariff treatment.

Classification becomes much easier when these details are gathered before sourcing, production, or entry filing begins. Keeping a current HTSUS reference is equally important, as tariff notes, duty rates, and reporting requirements are updated throughout the year.

How Does the Chapter Split Work Between Chapter 61 and Chapter 62? 

Before customs looks at fiber content, gender, or garment type, it asks a simpler question: Is the garment knit or woven?

That answer determines whether the product falls into Chapter 61 or Chapter 62 of the HTSUS.

• Chapter 61 covers knitted or crocheted apparel.

• Chapter 62 covers apparel that is not knitted or crocheted, including woven fabrics.

Common knit fabrics include jersey, rib knit, interlock, and piqué. T-shirts, sweatshirts, hoodies, and many polo shirts are usually classified in Chapter 61.

Common woven fabrics include denim, twill, poplin, flannel, and satin. Dress shirts, woven trousers, and many jackets typically fall under Chapter 62.

The distinction matters because the same garment category can carry different tariff classifications depending on how the fabric is constructed.

Mixed-construction garments add another layer of complexity. A jacket with a knit body and woven sleeves, for example, cannot always be classified by looking at a single component. In those cases, CBP evaluates which material gives the garment its primary character before determining the final classification.

For most apparel products, getting the knit-versus-woven decision right is the first and most important step in the classification process.

The Role of Fiber Content in Apparel Classification 

After the garment is placed in the correct chapter, fiber content becomes one of the biggest drivers of classification and duty rates.

Customs generally looks at the chief-weight fiber, which is simply the fiber that makes up the largest share of the garment by weight. Most apparel falls into one of four broad categories:

• Wool or fine animal hair, such as cashmere, alpaca, angora, and camel hair

• Cotton

• Man-made fibers (MMF), including polyester, nylon, rayon, viscose, lyocell, and spandex

• Other textile materials, such as silk, linen, hemp, ramie, and metallic yarns

Small changes in fiber composition can have a surprisingly large impact on duty costs.

One of the most important thresholds sits at the 50/50 split. A knit shirt made from 51% cotton and 49% polyester can be classified as cotton and attract a 19.7% duty rate. Change the blend to 50% cotton and 50% polyester, and the same garment may move into the man-made fiber category, increasing the duty rate to 32%.

Certain specialty fibers create additional classification challenges. Metallic yarns are treated as a separate textile category, which means even a relatively small amount can influence the final classification. Bamboo is another common source of confusion. Despite the marketing terminology, most bamboo apparel is made from regenerated cellulosic fiber and is classified as rayon, placing it within the man-made fiber category.

Product descriptions can also be misleading. Trade names do not determine classification. Customs focuses on the actual fiber type, so Lycra is treated as spandex, Lurex as metallic fiber, and Kevlar as aramid.

For importers, fiber content is more than a product specification. A small change in a fabric blend can alter the tariff classification, the applicable duty rate, and the landed cost of an entire shipment.

Duty Rate Comparison by Fiber Type and Garment Category 

The table below shows how duty rates can vary across common apparel categories based on fiber composition and garment designation.:

Some apparel classifications use compound duty rates, where duty is calculated using both the product's value and its weight. For example, certain men's woven shirts made from man-made fibers are subject to a rate that combines a percentage of the customs value with a charge per kilogram. In these cases, errors in either valuation or weight reporting can affect the final duty calculation, making accurate product data especially important. 

Gender and Age Can Affect Apparel Classification 

After construction and fiber content are determined, customs may also consider who the garment is designed for. Many apparel classifications in Chapters 61 and 62 are separated into men's or boys' and women's or girls' categories, which means the intended wearer can influence the final tariff code.

When a garment's design is unclear, CBP may look at features such as the direction of the closure. Garments that close left over right are generally classified as men's or boys' apparel, while garments that close right over left are generally classified as women's or girls' apparel. Products marketed as unisex require special attention. If a garment cannot be clearly identified as either men's or women's apparel, customs rules generally place it in the women's or girls' category. A "unisex" label alone does not create a separate classification category.

Age designation can be just as important. Garments designed for children with a body height of 86 cm or less (typically 0-24 months) may qualify as babies' apparel under the HTSUS. These products are classified separately from children's and adult garments and can be subject to different duty rates.

For importers, accurate sizing information and product specifications are often as important as fabric composition. A garment that falls on either side of the baby's apparel threshold may end up with a different tariff classification and duty treatment.

What Does the Garment-Type Step Actually Decide? 

After chapter, fiber, and gender are settled, the 4-digit heading turns on garment type:

Stitch count then resolves the borderline between heading 6105/6106 (shirts) and heading 6110 (sweaters). A knit garment with 9 or fewer stitches per 2 centimeters sits in 6110 as a sweater. A garment with 10 or more stitches per linear centimeter in each direction routes to 6105/6106 as a shirt. The measurement uses a linen tester on a flat, unstretched sample.

The cleanest way to see the four-step tree at work is to rotate construction, fiber, and gender across one garment - a lightweight crew-neck top - and watch the rate move:

Four patterns repeat across audit findings: construction produces the biggest divergence (different chapter); fiber composition can double the duty inside one heading (16.5% cotton T-shirt vs. 32% MMF T-shirt). A one-point blend shift across 50/50 moves the same garment across the cliff, and babies classification reliably produces lower rates, making the 86 cm body-height boundary commercially significant for 18-24 month sizes.

How Do Additional Duties Stack on Top of the Apparel Base Rate? 

The MFN duty rate is often only the starting point. Depending on the country of origin, additional tariffs and trade measures may apply on top of the base apparel duty rate.

Common layers include:

• Section 301 tariffs (China): Many apparel products imported from China are subject to an additional 25% tariff under Section 301. For example, a men's cotton knit shirt with a 19.7% MFN duty rate may face an effective duty burden of approximately 44.7% before other charges are considered.

• Section 122 tariffs: A temporary 10% baseline tariff currently applies to a broad range of imports from many countries, including apparel products covered by Chapters 61 and 62. Importers should verify the latest status before filing entries, as tariff measures can change.

• IEEPA tariffs: Country-specific emergency tariffs may apply to certain imports. Depending on the product and origin, these measures can significantly increase the total duty owed.

• AD/CVD measures: Anti-dumping (AD) and countervailing duties (CVD) are less common for finished garments but can apply to certain textile products, yarns, and fabrics. Checking applicable AD/CVD orders remains an important step when importing from a new supplier or sourcing market.
  
  
  

As a result, the final duty paid on an apparel shipment can be substantially higher than the MFN rate shown in the tariff schedule. 

Common Apparel Classification Errors 

Classification mistakes do not always result in underpaid duties, but they can still trigger compliance issues, audits, and penalties. Some of the most common errors include:

• Misclassifying polo shirts as woven shirts: Most polo shirts are made from piqué knit fabric and are typically classified as knit apparel rather than woven shirts.

• Incorrectly identifying the chief-weight fiber: A 51% polyester and 49% cotton garment is generally classified as a man-made fiber product, not a cotton product. Small differences in fiber composition can affect the applicable duty rate.

• Using shirt classifications for T-shirts: T-shirts, singlets, and similar garments without a neckline opening are generally classified separately from shirts and blouses.

• Treating unisex garments as men's apparel: Products that cannot be clearly identified as men's or women's garments may default to women's classifications under HTSUS rules.

• Overlooking babies' apparel provisions: Garments designed for children with a body height of 86 cm or less may qualify for separate babies' apparel classifications and different duty treatment.

• Misidentifying bamboo fiber: Most commercial bamboo textiles are classified as rayon rather than a natural vegetable fiber.

• Relying on supplier classifications without verification: The importer of record remains responsible for the accuracy of the tariff classification declared at entry.

Special Rules for Coated and Water-Resistant Garments

Garments with coatings or water-resistant treatments often follow different classification rules from standard apparel products.

A visibly coated knit garment may be classified differently from an uncoated knit garment, while visibly coated woven garments can fall under separate tariff provisions altogether. The distinction is important because the presence of a coating may change both the classification and the applicable duty rate.

Water-resistant garments can create additional complexity. Customs applies specific testing standards to determine whether a product qualifies for water-resistant treatment under the HTSUS, making product specifications and testing data important supporting documents during classification. For garments that include coatings, laminates, or water-resistant finishes, classification should be reviewed carefully before entry filing to avoid unexpected duty or compliance issues.

Building a More Reliable Apparel Classification Process 

The most common classification issues are often identified long before a shipment reaches customs. Strong compliance programs focus on validating product data early and reviewing classifications whenever sourcing, materials, or product specifications change.

A few practices can help reduce classification risk:

• Re-test fiber content when production changes: Small shifts in fabric composition can move a product into a different tariff provision and alter the applicable duty rate.

• Seek guidance for borderline classifications: Mixed-construction garments, coated products, and sizing edge cases often benefit from additional review before entry filing.

• Address errors as soon as they are discovered: Early action generally provides more options than waiting for a customs review or audit.

• Maintain consistent product data: Accurate information on construction, fiber content, gender designation, and sizing creates a stronger foundation for classification decisions.

As product catalogs grow, manually reviewing every SKU becomes increasingly difficult. Classification teams often need to monitor hundreds or thousands of products across different fabrics, blends, garment types, and sourcing locations.

Gaia helps simplify that process by automating apparel HS code classification and identifying common risk factors before entry filing. From 50/50 fiber-blend thresholds and unisex apparel rules to babies' garment classifications and construction-based chapter changes, Gaia helps teams classify products faster and with greater confidence.

Explore Gaia for free to see how AI-powered HS code classification can reduce manual review time and support more consistent apparel classification decisions at scale.

Frequently Asked Questions 

What happens to a garment when the chief-weight fiber sits exactly at 50/50?

When no single fiber predominates by weight, classification follows the heading that appears last in numerical order among the eligible options. A 50% cotton / 50% polyester knit shirt, therefore, falls into the man-made fiber category rather than cotton. In practice, a 50/50 blend may attract a 32% duty rate, while a 51/49 cotton-dominant blend remains at 19.7%. .

Are sets of a knit top and a woven bottom classified as one entry or two?

Usually, two. Garments classified under different HTSUS headings are generally entered separately, even when sold together as a retail set. Certain specifically named sets, such as suits, pajamas, swimwear, and track suits, are treated as a single classification unit. 

How does the unisex default actually change the duty math?

Garments that cannot be clearly identified as men's or women's apparel are generally classified under the women's provisions. In some cases, the duty rate remains the same. In others, the classification can affect the final duty calculation, making accurate product documentation important. 

When does a knit garment with a water-resistant coating route to Chapter 61 instead of 6113?

A knit garment routes to 6113 only when the knit fabric is itself a coated, covered, or laminated fabric of heading 5903, 5906, or 5907, and the coating/covering is visible to the naked eye; otherwise, it stays in the ordinary knit apparel headings of Chapter 61.

Does a binding ruling protect against a CBP lab test that finds a different fiber content?

No, a binding ruling protects against retroactive reclassification when the actual merchandise conforms to the sample submitted with the ruling request. If CBP tests the entered garment and finds fiber content inconsistent with the declared content, the test result governs and the ruling does not apply to that shipment. The fix is upstream: certified fiber analysis with every new production run and at every mill change.