Since my wife isn't that huge on top, she has gone without a BRA most of her life! But one of my favorites that plenty of friends noticed was when we went River Rafting with a group of friends for a exciting week end!
We weren't good at keeping the Canoe going in the right direction nor staying upright, so we left the camera and other Important things in the vehicle and not inside the Canoe with Us!
But after a few time in the Cold water, my wife had her tight top clinging to her body and I was even amazed to see her medium size nipples pointing so well thru her shirt!
More of the funny part was the more we overturned into the water, the more friends as well as strangers we had going to side of the river bank to see my wife walking around trying to wring out her top and having a bit of an Oops at the same time!

Later in life going to Fantasy Festival and the BAR's there, she started out dancing on the counter top with some other girlfriends but ended up leaving her BRA hanging on the ceiling rafters! lol
That got kind of costly after a few BRA's left there, so now we know why most of the women there don't come with any BRA's from the start~