Quite frankly I think it's silly to care if you look "pretty" or are "revealing" when you're up on display for anyone to see you push a human out of your vagina.
I stuck with the hospital gown and will do so again. If you're worried about being revealing before labor, say, as you walk around the hospital if you're able to do so during earlier labor stages, then bring your own "cute" robe to make sure you stay warm enough & aren't overexposed.
Now, looking "pretty" after? For pics? That I get. Some people even touch up makeup. I was too tired to care and wasn't wearing makeup to start with. That's cool too.