Really nice fabric. (I haven't washed it yet.) The fit is pretty snug, especially if you have a larger chest. If you want to wear on its own and like shirts that are fitted at the top and sleeves (it flows out nicely at the bottom) then go true to size; if you want to layer it go up a size! The back is prettier untied than I thought it would be :)
This top is very comfortable and soft. I ordered a medium which usual size for senita tanks/tops and it fits perfectly both tied in the back or loose. I haven't worn it to workout in but it's definitely cute with jeans!
I really like the fit of this top and I wear my bronze one so often I decided to get navy as well and might get the other colors, too! I am between XS and small and like the fit of the XS, which I always wear tied because it seems to be more flattering. I don't work out in this, because it's more cottony than performance fabric, and I sweat a lot. I typically wear this with jeans. The only issue is it shows wear rather quickly. After a couple washes, the fabric shows significant pilling. I wash delicate and hang dry, so I think it should be a bit more durable.