After extensive research (well, OK, trial and error on my part) what works best to hide nipples is anything loose, dark coloured, and highly patterned.
Anything light coloured may let the areola and nipple colour show and anything tight tends to show the outline of the nipple. Plain dark colours tend to allow the outline of the nipple to show but a pattern distracts the eye from any details.
After I realised this, I bought a lot of cheap t-shirts that fit the bill and I’m much happier now that I never wear a bra. I hope you find a solution that works just as well for you.
Anything light coloured may let the areola and nipple colour show and anything tight tends to show the outline of the nipple. Plain dark colours tend to allow the outline of the nipple to show but a pattern distracts the eye from any details.
After I realised this, I bought a lot of cheap t-shirts that fit the bill and I’m much happier now that I never wear a bra. I hope you find a solution that works just as well for you.