6104.59 - Of other textile materials:

This HTS category, 6104.59, encompasses skirts and divided skirts that are knitted or crocheted and are not made of wool, fine animal hair, cotton, or synthetic fibers. Essentially, it serves as a residual category for skirts made from "other textile materials" not specifically listed in the preceding sibling subheadings. This would include items predominantly composed of artificial fibers, silk, or blends thereof, provided they do not meet the specific criteria of the more defined categories.

The key differentiator for 6104.59 lies in its material composition. Unlike sibling categories 6104.51 (wool/fine animal hair), 6104.52 (cotton), and 6104.53 (synthetic fibers), this classification is for skirts made from a broader range of textile inputs. It is crucial to analyze the predominant fiber content by weight to correctly exclude items falling into the more specific sibling categories.

Within this broad category, further distinctions are made in its subcategories. Specifically, 6104.59.10 addresses skirts made of artificial fibers, while 6104.59.40.00 isolates those containing 70 percent or more by weight of silk or silk waste. The residual subheading, 6104.59.80, captures all other knitted or crocheted skirts that do not fall into these more granular classifications, effectively covering any remaining "other textile materials."