Make money. Sewing shop owners can also make custom pajamas, nightdresses and so on. If they are engaged in mending clothes, or changing the size, thinness and zipper of clothes. A seemingly insignificant business, but it is very profitable. They sell pajamas in the community to make money. Pajamas have always been a symbol of western lifestyle. Speaking of the origin of this word, you may feel strange, because such a "foreign flavor" thing is actually an authentic foreign word.