6106.90 - Of other textile materials:

This HTS category, 6106.90, encompasses knitted or crocheted blouses and shirts specifically manufactured from textile materials other than cotton or man-made fibers. This means garments falling under this classification are made from materials such as wool, fine animal hair, silk, or other natural or synthetic fibers not explicitly covered by sibling categories. The key characteristic is the knitting or crocheting method of construction and the primary textile composition, excluding those already detailed.

It is crucial to distinguish this category from its siblings. HTS code 6106.10.00 specifically covers blouses and shirts of cotton, while 6106.20 pertains to those made from man-made fibers. Therefore, 6106.90 serves as a residual category for knitted or crocheted women's or girls' blouses and shirts that do not fit into these preceding, more specific material-based classifications.

The subcategories within 6106.90 further refine the classification based on the specific "other" textile materials. It is divided into classifications for articles made of wool or fine animal hair (6106.90.10), articles made of silk or silk waste, and a residual "other" category (6106.90.30) for any remaining textile materials not otherwise specified. This hierarchical structure ensures accurate tariff application based on the precise material composition of the garment.