Fits true to size and I love the low back. I try and wear it with a halter sports bra so that it flows with the tank but I've also worn it with a strappy bra and it's super cute. Love the color too!
This top fits true to size IF you buy for your bust - I'm a 32D, 5'6", and about 130 - the Medium fits well. My only complaint is that the halter strap is a little long, so it sits low on the bust and sometimes puckers up above the neck..but nothing a little adjusting won't fix. If you have small shoulders it's probably not for you...
The fabric is ah-mazing: lightweight, breathable, yet durable. It washes well (I cold water wash in the machine even though it calls for hand washing - because WHO has time for that?) and hang dry, which is so quick with this fabric.
I wouldn't wear this top for my practice, because it's so minimalistic, and is loose below the bust, but this is great for walking, the gym, even errands (ha!)..I layer it with a cute sports bra, which is a MUST because there is no lining, no built-in bra, and it would be see-through in the bust (nips, ahh!).
I would own several of these if they came in other colors - for the price you can't go wrong.