It's a popular fantasy item. I've known adult woman who wore it, eg for Halloween, costume parties, etc.
Discussion
Hell, I've seen women over 18 wear _their_ former school uniform for Halloween.
CUE THE MEAN GIRLS CLIP GLEN COCO!! https://m.youtube.com/watch?v=ei__hV1R7jo
Heh, never watched that movie.
YouUnculturedSwine.jpeg https://m.youtube.com/watch?v=SDXTQqCQpfY