Any plastic diaper that can keep your clothes dry.
I have worn thin medicals and very thick ABDL diapers and as far as I know none have seen anything, or at least never said anything with either eyes or mouth.
This while wearing jeans or other baggy clothes. And being male, so a bulge in front is normal.
I never go shopping in my thin hiking pants.
Because when I can see the diaper outline in the mirror...
People hiking rarely look back, and I never have anyone behind me.