prAna Sabin Racer Tank Top
I really like prAna's tops for hot Bikram yoga. However, as other reviewers have noted, prAna does not seem to design for those of us who are not so busty. I find that I never fill out the internal shelf bra (on size Small or Medium, and Smalls are skin tight on me everywhere else). I find that most of prAna's tops are too revealing when in forward bending poses. I recommend the Sabin Racer for that very reason, good coverage. It's also a cute design. prAna calls this synthetic performance fabric Chakara and it's awesome for hot yoga. It's incredibly soft, and still really comfortable when soaking wet.