You don't need to. The US Product Safety Commission attorney spells it out here. No ban on old clothes.
I must be reading your link different than you are.
I read the Phthalate ban starting on manufactured clothes,etc. on Feb 10th but the lead compliance is retroactive on any item. In order to comply with the law each individual item must be tested$$ to make sure it doesn’t contain lead.
One of those guilty until proven innocent laws.