Ask whether the US business is the seller, an importer, a measuring agent or an independently contracted alteration service. Do not infer its role from a US telephone number or an appointment address.

Recommended responsibility schedule:

Issue Commitment to obtain before deposit
Contracting party Which legal entity owes the garment and any refund?
Fitting Who approves measurements, intermediate fit and final acceptance?
Imports Who arranges entry and pays duty, fees and reassessments?
Compliance Who resolves carrier questions about labels or certificates?
Corrections Who authorizes and pays for local work?
Remake Who decides, on what evidence, and by what deadline?
Return shipment Who supplies instructions and pays each direction?
Data Who receives measurements and photographs, and for what purposes?

For corrections requiring a return to Vietnam, obtain written return-and-reimport instructions before dispatch. Preserve the original invoice and entry records, and require a new customs assessment if a replacement garment will be supplied. Do not assume that “free remake” means free shipping, clearance or local fitting.