

They are invariably being held to the strictest scrutiny because they offended the inspectors, but country of origin labeling isn’t so customs knows where it came from, but so consumers do.
https://www.cbp.gov/trade/rulings/informed-compliance-publications/marking-country-origin-us-imports
They obviously know where the shipment came from
They know where the package came from, but the shirts are required to have a label for the consumer to know.