The US schedule includes separate lines for vests that are explicitly not sweater vests (6110110050 for men's/boys', 6110110060 for women's/girls'). A traditional sweater vest — a sleeveless pullover in a sweater construction — is classified under the sweater lines, while a non-sweater-style vest (such as a knit waistcoat with a different construction) falls under the vest lines. The distinction turns on construction and commercial presentation.

At the HS6 and 10-digit level, heading 611011 covers all wool sweaters without distinguishing fiber grade or micron count — Merino, lambswool, and standard wool are all classified here. Fiber grade affects commercial value and may be relevant to customs valuation, but it does not create a separate tariff line within this heading. Cashmere (Kashmir goat fiber) is the one fine animal hair that has its own dedicated heading (611012).