6207.99.70 - Containing 70 percent or more by weight of silk or silk waste

This HTS classification, 6207.99.70, specifically pertains to men's or boys' undergarments, sleepwear, and similar articles not knitted or crocheted, when such items are primarily composed of silk or silk waste, containing 70 percent or more by weight of these luxurious materials. This subcategory falls under "Other" textile materials within the broader "Men's or boys' singlets and other undershirts, underpants, briefs, nightshirts, pajamas, bathrobes, dressing gowns and similar articles."

It is important to distinguish this category from its siblings. While other categories at this level may cover articles made of wool, fine animal hair, or man-made fibers, 6207.99.70 is exclusively for those articles where silk or silk waste is the predominant fiber content. The sibling category "6207.99.90: Other" would encompass similar articles made from textile materials not otherwise specified within this broader group, but without the dominant silk composition.

The subcategories under 6207.99.70 further refine the classification based on the specific use of the silk articles. These include bathrobes, dressing gowns, and similar loungewear items, as well as sleepwear such as pajamas. A residual "Other" subcategory exists to capture any remaining silk garments that do not fit into these more specific uses, ensuring comprehensive classification within this high-quality textile segment.