Generally speaking, there should be a trademark on the back of clothes. There are often three situations when there is no trademark. First of all, the manufacturer itself has no trademark, so the price of such clothes should be cheaper. Second, the overstocked products of some big brands are sold at low prices after cutting the trademarks, so that clothes can basically see the traces of sewing trademarks. Thirdly, some clothes, especially those that are close to the skin, are no longer stitched with trademarks on the back for fear that the trademarks will rub against the skin. Signs in other places should be complete.