They were originally intended (molke) as breastfeeding bras, but they have a cult following, and I think theres just as many non-breastfeeders who use them just because theyre so comfy and supportive. I havent breastfed for 10 years.
They dont give monoboob and they lift really well and are supremely comfortable. They are perfect as Tshirt bras.
Just a suggestion anyway. No need to be rude :)