Oooh, yes, Crem, thank you. That's a good site, I will get dd to look at it this evening and see what sort of things she is interested in. I don't even know what sort of bra you would wear with some of those dresses. This kind of thing has absolutely never been in my skill set.
I don't think we have the sort of charity shops round here that would have any prom dresses. They are full of dead old people's clothes. And bric-a-brac. Everyone flogs their prom dresses on ebay, I think.