What to wear to surprise my boyfriend?

It's my anniversary in 3 weeks and we're going away for the weekend. For Valentine's Day I gave my boyfriend a book of coupons and one of the ones he has decided to redeem on for our anniversary is for me to buy new lingerie and model it for him. It was meant to be his choice, but he has decided he'd like me to surprise him instead. The store I'm going to buy the lingerie at is having a sale at the moment, so I've decided to buy a few things. I've already settled on a cute little babydoll with matching panties, but I wanted to buy a costume and I'm not sure which one he'd rather? I've narrowed it down to a police outfit and an air hostess outfit - which would you rather wear/see a girl wear?