I once wore something very similar to a party when I was in my early 20's (Im now early 30's). Before I left my nan said I looked "...like a prozzy!" I was really hurt but I just put it down to her age. But on arrival a colleague announced loudly "did u forget to get dressed, you've turned up in your nightie! Hahahah!" ...I was mortified, felt uncomfortable all evening and never wore the dress again.
It is a lovely dress though OP, Im sure people are far more accepting of a dress like this these days