CN code 620463 covers women's and girls' trousers of synthetic fibers, other than knitted or crocheted, including bib and brace overalls, breeches, and shorts. Synthetic fibers include polyester, polyamide, and acrylic. Women's polyester trousers form a significant segment of workwear, uniform, and casual woven clothing. Classification requires the synthetic fiber to be the predominant fiber by weight. Trousers from polyester-cotton blends where polyester predominates are classified under this code. The product must be woven.

Synthetic fiber trousers are subject to labeling requirements of Regulation (EU) No 1007/2011. REACH requirements apply to disperse dyes, PFAS substances, and formaldehyde. Metal components must comply with nickel limits. The GPSR requires traceability and risk assessment. Girls' trousers face stricter mechanical safety requirements. Workwear trousers with flame retardant substances may require additional REACH documentation.

Women's synthetic fiber trousers imported into the EU originate from China, Vietnam, Bangladesh, and Turkey. Origin rules require double transformation. Customs documentation must describe the trouser type and fiber composition. Tariff preferences depend on the country of origin - EVFTA for Vietnam, EBA for Bangladesh, customs union for Turkey. Customs authorities may verify fiber content.

CN 6204 63 covers women's trousers of woven synthetic fibre fabric, including trekking, ski, softshell and casual trousers. Polyester and polyamide fabrics with breathable membranes are classified here provided they are woven, not knitted. The key distinction is between woven trousers (CN 6204 63) and knitted trousers (CN 6104 63). Importers must correctly identify the fabric construction method, as it directly determines tariff classification.