After shipment of a textile fiber product in commerce it shall be unlawful, except as provided in this subchapter, to remove or mutilate, or cause or participate in the removal or mutilation of, prior to the time any textile fiber product is sold and delivered to the ultimate consumer, any stamp, tag, label, or other identification required by this subchapter to be affixed to such textile fiber product, and any person violating this section shall be guilty of an unfair method of competition, and an unfair or deceptive act or practice, under the Federal Trade Commission Act [15 U.S.C. 41 et seq.].