It seems to be a custom in Taiwan that sales girls working in somewhat smaller fashion outlets and boutiques have to dress/style up - quite often actually wearing some of the items that this particular shop sells.
I think that somehow makes them to something like living mannequins. In addition to the actual clothes, often accompanied by very heavy makeup, high heels (maybe even platform heels). Very fascinating. In fact, they might be a bigger attraction than the actual shop.
And I honestly appreciate the amount of effort they put in their styling, especially if they are no natural beauties at all.