CN code 620341 covers men's and boys' trousers of wool or fine animal hair, other than knitted or crocheted, including bib and brace overalls, breeches, and shorts. Wool includes sheep's wool, cashmere, mohair, and alpaca. Classification requires wool to be the predominant fiber by weight. Wool trousers form a significant segment of formal and business clothing. This heading covers both suit trousers and casual trousers of woven wool, provided they are not imported as part of a suit. Trousers imported together with a jacket from the same fabric are classified as a suit under 620311. Trousers imported as standalone articles, even if matching a separately delivered jacket, are classified individually under 620341.

Wool trousers imported into the EU require fiber composition labels under Regulation (EU) No 1007/2011. Labels may include the designation pure new wool or cashmere provided quality criteria are met. The percentage of each fiber is stated with a tolerance of up to 3 percent by weight. REACH requirements apply to acid and metal complex dyes used for wool, formaldehyde, and nickel in metal components such as buttons, zippers, and belt buckles. The GPSR imposes product traceability and safety documentation obligations. Children's trousers are subject to stricter mechanical safety requirements for drawstrings and cords under EN 14682.

Wool trousers imported into the EU originate mainly from Italy, China, Turkey, and Vietnam. Italian wool trousers are valued for fabric quality from the Biella and Prato regions. Imports from China are subject to standard MFN rates. Turkey benefits from the customs union, Vietnam from the EVFTA. Origin rules require double transformation from the spinning stage. Customs documentation must clearly indicate that trousers are imported as a standalone article, not as a suit component. Customs authorities verify fiber composition and may take samples for laboratory analysis. For regular imports of wool trousers, obtaining Binding Tariff Information ensuring classification certainty is recommended.

Woven trousers under CN 6203 41 from Chapter 62 imported from outside the EU require a customs declaration in the national import system. Documentation includes a commercial invoice with goods description, packing list, certificate of origin (EUR.1, Form A or invoice declaration) and fibre composition certificate. Customs value is determined using the transaction value method. Duty calculated on CIF value forms the base for import VAT calculation.