This is a Lululemon lilac light purple cool racer back tank top.
Here is a full view of the front of the top. It is a smooth thinner fabric.
This is a full view of the side of the top. It is fairly long.
This is a full view of the back of the tank. You can see the racer back.
Here is a close up of the top of the top. Here is a small silver omega Lululemon symbol.
I love this tank because of the bright color and the length. I have it in other colors, too.
Thanks to Stephanie for letting me know that this is the cool racerback top!