6103.10.40.00 - Containing 23 percent or more by weight of wool or fine animal hair (443)

This classification pertains to knitted or crocheted suits for men and boys specifically composed of artificial fibers. These garments are designed as coordinated sets, typically including a jacket and trousers or shorts, intended for formal or semi-formal wear. The defining characteristic for classification under this heading is that the fabric comprising the suit must be primarily made from artificial fibers, such as rayon, modal, or nylon, meeting the criteria for this material composition.

Distinguishing this category from its sibling, 6103.10.50.00, which covers "Other" suits, is crucial for accurate classification. While this node strictly defines suits made from artificial fibers, the sibling category would encompass suits constructed from any other textile material not specifically enumerated elsewhere within the suits section. This includes, but is not limited to, suits made from silk, or blends where artificial fibers are not the predominant component or are absent altogether.

As a leaf node, 6103.10.40.00 does not have further subcategories. Therefore, the classification hinges directly on the material content of the suit. Importers and exporters must ensure the garment is indeed a knitted or crocheted suit for men or boys and that its predominant fiber content, by weight, consists of artificial fibers to fall under this specific HTS code.