A colleague of DH is having a 40th birthday party next month and we've been invited. It's a red and black themed party - all of the men are to wear black and all of the women red. I mean, WTF? Apart from the fact that red looks awful on me, why on earth should I be forced to go out and buy something in a colour I never wear to attend this party. DH thinks it's a bit cheeky as well. AIBU to simply regret the invite and say we're doing something else that night?