Textiles are not a durable good, and the U.S. does not determine whether a product is manufactured here according to what someone claims on a label.
Further elaboration is needed. If 50% of the cost of a product is done in the US then it can claim the "Made in the USA" lable. Belive me, there are many trick and importers engage in to earn that lable, when in fact the vast majority of the work is done outside of the USA.