I too jumped on the Gap mesh sweater when it was on sale and ordered it in 2 colors, white and cobalt.

I tried it on quickly and thought it fit fine and I liked the colors so into my closet they went. Yesterday I wore the cobalt one and I was disappointed with it. It seemed to stretch out a good bit and it got quite creased very quickly. I don't mind wrinkles in shirts but I didn't like how it looked in the sweater. It just felt baggy and too thin and just not good quality.

Maybe I will feel better in the white one when it's really hot and appreciate the light weight a little more.