In the summer time, having a bra like this for wearing under tank tops when at home or sleeping in is a godsend for avoiding underboob sweat or maintaining modesty if guests are over. I have 2 VERY old Champion sports bras I've been wearing for this purpose, but having purchased them many cup sizes ago, a sneeze and I'd be exposed. Wanting to upgrade, I bought three that appeared similar enough and ended up keeping them all, with varying results.
NOTE: If you are at all endowed in the chest, do not use this for a sports bra. Invest in Panache, it's worth every penny.

This one was far and away the winner. The fit was perfect for providing support if walking around the house, but I could sleep without feeling constricted. While it didn't look very appealing, this is only for sleeping or maybe poking out of a tank top I just wear around the house, so look wasn't vital.

My favorite of the three ended up being the Champion Freedom Seamless.