To bra or not to bra...

I wondered today when it's okay to NOT wear a bra, if you're a usual bra-wearer. I went out in a hurry to get hubby's christmas present and I just put on a black sweatshirt and jeans and ran out the door, didn't even do makeup or hair- he was in the shower and I thought I could do the errand before he was out (I was wrong btw). Anyway so here I was in public running around without a bra but black sweatshirt. Probably NOT noticeable to strangers who saw me for like 2 seconds as I ran by. But I don't think I'd hang out in a crowd without the bra no matter how black the shirt is. There's always a side view :P