I have a few different onesies: hippo, batman, christmas (green) all bought from Walmart but my two faves lately are Me undies: I have a christmas (red) one and a spiderman one. they are super thin!
all of them I have worn with briefs under (only uw I wear) but I prefer to freeball aka be naked under them!
@Bodymindsoul the ones that I own have never had one, they are zipper ones. I should look more into purchasing some with the flap in the crotch or better yet butt flap. any recommendations that are stylish?