Bras, why?

So the outside of a bra is all silky feeling and super sexy and really made to wow men....not sure if the bra wows them or it's the tits but I feel the bra helps with the lace and smooth sexy feel of it

Why can't the inside of a bra be silky feeling as well. All mine are cotton sand paper feeling on the inside and don't feel good to me. The bra has padding so even if we get perky nipples, no one would notice. I feel we women need better inner material in our bras that would allow them to slide a bit but not flop out. Giving us a silky material against our sensitive nipples would be a good thing for us, correct?