Those H&M ads ->

[TrillianAstra]

Girls skirts age 9-14.

Well, the biggest size is labelled as 14+

I'm (aged, not sized) 14+

How wrong would it be, if they had something I liked, to wear it as an adult?

Interestingly the gypsy skirt in the ad (which I don't like that much anyway) doesn't seem to be on the online store.

Well I have worn some of of their knitwear and a jacket that were aged 14 and I am middle aged

I suspect the skirts might be a tad short for me but if you like them go for it