Track suits under 6112 are specifically designed for sporting or athletic use, typically featuring characteristics such as elasticized cuffs, drawstring waists, or moisture-wicking fabric construction. A knit two-piece leisure or lounge set without those athletic design features is more likely to classify under the general sweater or trouser headings. The article's intended use and design features are the primary classification tests.

Rash guards worn as swimwear or surf apparel can fall under the swimwear subheadings of 6112 if they are designed and marketed for aquatic use. However, if the article more closely resembles a general athletic top or T-shirt, it may be redirected to heading 6109. Importers should document the article's intended use and construction to support the classification.