It takes confidence in a mom about town to wear a tight t-shirt with no bra to the grocery store. I'd highly recommend more of the PTA set at least take the opportunity to give it a whirl. Let Britney Spears be your role model. The 30-something pop diva has forever eschewed the wearing of undergarments, even when in mother mode at the super market picking up some beans and things.
Britney gave the gentleman oglers pretending to pick lettuce at the local Vons quite a stir in their meat departments as her nipples and breasts were rather visibly shaped beneath her braless tee. I've always admired Britney for her free wheeling wardrobe ways. Given the time she's put into her recent show-ready fitness routine, all the better. Let us all be more like Britney. The command part at least. Enjoy.