6101.90 - Of other textile materials:

This HTS category, 6101.90, covers men's or boys' outerwear and similar garments that are knitted or crocheted, specifically those not classified under heading 6103. These articles include overcoats, carcoats, capes, cloaks, anoraks (including ski-jackets), windbreakers, and other similar protective or outer garments. The defining characteristic of this group is that they are fabricated from textile materials other than cotton or man-made fibers.

In contrast to its sibling categories, 6101.20.00 and 6101.30, which specifically designate garments of cotton and man-made fibers respectively, 6101.90 encompasses a broader range of materials. This ensures that garments made from less common natural fibers or blends not falling into the primary categories are correctly classified.

The subcategories within 6101.90 provide further refinement based on the specific textile composition. This includes classifications for garments made of wool or fine animal hair (6101.90.05.00), articles predominantly composed of silk or silk waste (6101.90.10.00), and a residual "other" category (6101.90.90) for all remaining textile materials not otherwise specified. This granular approach allows for precise classification based on the predominant material content.