6203.11.15.00 - Of worsted wool fabric, made of wool yarn having an average fiber diameter of 18.5 microns or less (443)

This HTS category, 6203.11.15.00, specifically classifies men's or boys' suits that are constructed from worsted wool fabric. The defining characteristic of this classification is that the wool yarn used in the fabric must have an average fiber diameter of 18.5 microns or less. This detailed specification focuses on the fineness of the wool, indicating a premium quality and often a smoother, more luxurious feel to the finished suit.

It is important to distinguish this category from its sibling, 6203.11.30.00, which is designated as "Other." While both fall under the umbrella of men's or boys' wool suits, the "Other" category would encompass suits not meeting the specific 18.5 microns or less fiber diameter requirement. Therefore, classification into 6203.11.15.00 hinges on the precise measurement of the wool fiber diameter within the fabric.

As this is a leaf node within the HTS structure, there are no further subcategories to introduce. Classification under this code signifies the end of the detailed breakdown for suits meeting these precise wool fiber specifications. When classifying, one should ensure the garment is indeed a suit, made of worsted wool fabric, and that the wool yarn's average fiber diameter is verifiably 18.5 microns or less.