6208.99 - Of other textile materials:

This HTS category, 6208.99, encompasses women's or girls' undergarments and similar sleepwear or loungewear articles that are not knitted or crocheted, and are made from textile materials other than cotton or man-made fibers. It serves as a residual classification for articles falling under heading 6208 but not specifically enumerated in preceding subcategories. Examples include items crafted from silk, wool, fine animal hair, or other vegetable textile materials.

Distinguishing this category from its siblings, 6208.91 specifically covers articles of cotton, while 6208.92.00 is reserved for those made from man-made fibers. Therefore, 6208.99 is for garments made from any other textile material not falling into these two specific groups. The intent is to ensure comprehensive classification within the heading by capturing all remaining material compositions for these apparel types.

To further refine classification within this category, several subcategories exist. 6208.99.20 is designated for articles made of wool or fine animal hair. A separate, but not explicitly detailed in the provided structure, subdivision exists for articles of silk or silk waste. Finally, the residual subcategory 6208.99.80, "Other," is intended for any remaining textile materials that do not fit into the more specific subheadings. This hierarchical structure allows for precise tariff determination based on the primary textile component of the garment.