OK. On one hand, this totally would not happen in real life, people are totally right about that. On the other, in this story it's just moronic to insert all this NTR fuckwittery people are yacking about (which also doesn't much happen in real life--in real life, if you go to those things it's like you vaguely remember these people, and the ones you hated are disappointingly normal human beings now, the ones you were friends with you have nothing in common any more, and the ones you were into are, yes, married, but anyway you can't really remember why you had a thing for them and they look kind of frumpy now).
As to the dress, it's great and such dresses should be encouraged.