I, too, wish I could do without mine. But gravity has gotten to me as well. The rash that developes if I don't wear one doesn't make the "freedom" worth it. I do wear old raggegy ones around the house, tho. (Streached out and frayed.) But, If I go anywhere, I have to change into a "good" one. Cross Your Heart worked well for me, but have trouble finding them now.
(Although when I totaled my truck and the seatbelt caused so much damage to my "chest", the bra just irritated the injuries. Still today - a little more than a month later - seatbelts will be uncomfortable at times.)