6103.39 - Of other textile materials:

This HTS classification, 6103.39, pertains to men's or boys' suit-type jackets and blazers that are knitted or crocheted, but are made from textile materials other than wool, fine animal hair, cotton, or synthetic fibers. This broad category encompasses garments where the primary textile content does not fall into the more specifically defined preceding subheadings.

The key distinction of this category lies in its residual nature. It differs from its siblings, 6103.31 (wool or fine animal hair), 6103.32 (cotton), and 6103.33 (synthetic fibers), by excluding garments primarily composed of these specific materials. Therefore, if a knitted or crocheted suit-type jacket or blazer is not predominantly wool, cotton, or synthetic, it will likely fall within this "of other textile materials" classification.

Within 6103.39, further distinctions are made to account for variations in material composition. Subheadings exist for garments specifically made of artificial fibers (6103.39.10), those containing 70 percent or more by weight of silk or silk waste (6103.39.40), and a general "Other" category (6103.39.80) for all remaining suit-type jackets and blazers made from knitted or crocheted textile materials not otherwise specified.