I ordered a size up because I don't like too form-hugging tops most of the time, especially in thin fabrics. I don't want to worry about bra lines showing or a little pudge or being too warm: a little extra room helps on hot days, of which there are many where I live.
It's perfect.
The straps are just right for hiding bra straps, the cut is nice, and the fabric is thin and soft, breathable and fine tucked in (not bunchy). I love the red stripe -- it's a softer red, and fine lines, so it's a more delicate look, which I like. The collar and armholes are finished very nicely with the stripes on a diagonal -- a subtle and tasteful extra touch that I really appreciate. I love it so much I bought one for my mom, which she also loves, and another one in the tan stripe for myself.
My only worry is that they are feeling a little looser already; I'm hoping they aren't stretching out so quickly. Since they're a size up, they can easily become too big for me -- especially since they can slip in the front to expose the top of one of my bra cups sometimes. I could get a bra with lower cup material, but the worry is they will strech out all over and look too big on me rather than loose-fitting and comfy. We'll see.