i'll take this skirt.
skirt 本身就是短裙的意思.
i'll take it.一般来说就是买单.
我觉得这样就好了.不用说buy,short dress.可以说
供参考.你要是先表示过去时,（我刚刚又看了一下,）可以说 i bought that skirt./i've bought that skirt.