This summer I've been very happy with the Soma brand camisole bra.http://tinyurl.com/346azod I've worn it under low-cut tops when it's been too hot to wear a full camisole. It looks great peeking out under the Gap cowl-neck tee in the youlookfab store. The lacy straps are a plus if I'm wearing a tank - no big deal if a strap shows. It comes in a bunch of colors, and it's buy one, get one 50% off.
It does run small, so be sure to try before you buy.
