Most Helpful Guy
Try a dress-shirt sort of thing. It's getting hotter where I live, so it'll be appropriate now.
They're sort of like a really long top, that widens as it goes down, and normally doesn't have sleeves, just straps over the shoulders. It's not revealing at all, but it's light, goes down to about just past the bum, but is loose and wide, and very breezy, allowing you to keep cool in the summer. Since it is loose, you won't have to worry about your rolls hanging out either, lol.
Under that, on your legs, I'd recommend something baggy or something you feel comfortable in, that matches your upper top. No need for a dress or a skirt, you could simply wear brethable cargo pants or something.
Then just sneakers or sandles. Something like that.
Decorate with jewelry and you'll look fabulous in the sun. :)