My fiancé has a big company party to go to that he needs to dress up for. Of course we go out…

My fiancé has a big company party to go to that he needs to dress up for. Of course we go out shopping and he acts like a cry baby yesterday. Today he tells me he has nothing to wear. I literally just told him "yesterday you made it miserable. I don't want you asking me for help or to go with you"... I don't have patience to be nice and helpful to ungrateful brats.