C,
If you have a few bucks, try shopping discount stores for sports bras of a thick fabric and a size down: ie a tight fit. Or.. underwire bras with thick fabric and a tight fit.
Also.
There is also the bandaid method. Used for millenia to keep nipsters with a mind of their own from poking through every bra and every shirt to be noticed by every wandering eye with curiosity, this method involves the "X"ing of 2 bandaids tightly per (...). 1. they are flattened so they dont feel as much: touch. 2. Nobody can see em and they round off the bra wearing experience by 'easing the mind'
I tended to wear a sports bra; 2 layers of tight tanks; 1 over tank or t shirt + bandaids over my nips. I didnt have a sensitivity issue. I didn't feel a thing-still don't. but others would be like......."Excited today?
" and I had a public job and just couldn't have that.
I say a smaller size down because it should reduce the brush of the fabric by holding against you more securly.
brave question.
Good luck. You should re-discuss this with your mother.
_________________
"I'm sorry Katya, my dear, but where we come from, your what's known as a pet; a not quite human novelty. It's why we brought you.... It's nothing to be ashamed of, my dear, but here you are and here you'll sit."