Delivery Robe?

I am planning on having a water birth in a birthing center. I like the idea of a delivery robe or something I will be able to wear to somewhat stay more modest. I've seen two piece bikini-style outfits made for water birthing but the birth center I chose has an outdoor walking trail for laboring and I would like to wear something that wouldn't involve me changing everytime I would like to step outside. Ideas or links are appreciated! Thanks in advance!