Japanese fashion as party costumes

When I was out walking I went passed a party store we have here in Stockholm called Buttericks, it's a costume and magic shop. They mostly have cheap looking costumes and wigs for halloweens or costume parties. I was surprised to see that the display right now was lolita dresses. I don't really know what to think, I know that there'a a bunch of serious lolitas out there that only wear designer dresses and to know that their lifestyle's nothing more than a party costume to some might offend them.