Yes. It'll be horrible if you go in your damn robes, Reimu. You're not going in your robes.

...I'll take you shopping and buy you a dress. [Or steal it. Probably steal it.] Oh, and you're going to Prom with Nitori, ok? I figure you're too lazy to get a date and Nitori wanted to go. So I told her to ask you.

So be nice and go with her.