Short answer: Fashion brands should calculate from each garment or accessory SKU because fiber content, construction, origin, and cart mix can change duty and the per-item-category charge.
Why apparel catalogs are difficult
- Similar-looking products can classify differently by material and construction.
- Variants and bundles create more than one item category in a parcel.
Data to clean first
- Fiber composition, garment type, intended wearer, construction, and manufacturing origin.
- Variant-level SKU mapping for mixed-material and accessory lines.
Checkout controls
- Calculate from the actual cart.
- Keep an audit trail for the product inputs used in each order.