Re: S/O Water Birthing Outfits!
I wore a sports bra for my first waterbirth (with DS3). I planned on wearing a sports bra again with DD, but ended up not doing a waterbirth.
If you want to be modest, I'd go with a the top from a tankini style swimsuit. Honestly though, once things are going, you're not going to worry about being modest all you'll care about is getting the baby out. LOL