CBP looks at construction features: suit-type jackets and blazers are typically fully or partially lined, have structured fronts with lapels, and are designed for formal or business wear. Casual jackets without these tailoring features, or pull-over/zip-front outerwear, are more likely to classify as anoraks or windbreakers. When a garment has borderline features, importers should request a binding ruling from CBP before importation to avoid reclassification risk.

Yes — fiber content is a primary determinant of the applicable HTS 10-digit classification and associated duty rate for men's woven jackets and blazers. Wool and fine animal hair blazers, cotton blazers, and synthetic-fiber blazers each fall under different tariff lines with potentially different rates. Accurate fiber content declaration and labeling are therefore essential for correct duty assessment.