A number of ebay sellers are registered under USA addresses, but ship from places like China. Most, if not all, are selling fakes. They do this in order to put people at their ease, as many assume that nobody in the states would be stupid enough to risk selling fake clothing. Ebay shows the registration address in the search results page, not where they intend to ship from.
I have nothing against Chinese made goods, but I'd stay away from these types of ebay sellers.