I'd agree with trying rompers and maxi dresses, especially those made of really light-weight fabrics-- cotton, thin jersey, etc.

Also, you could try some sheer layers to mix it up? A sheer blouse maybe, or a lace overlay tank?

I don't really know a whole lot about warm weather dressing, seeing as I could basically wear a jacket the whole year round, but I think the above might give you a chance to mix it up without making you too hot and sticky. xD

Well I like your hot weather outfit Mo, it looks refreshingly cool to me. I suppose you can go for one piece, a dress maybe that doesn't cling, perhaps a surrender the waist look? The less fabric touching the cooler it is? (Although I like your outfit a lot)