When it's this hot (over 100 consistently) it just isn't worth trying to over complicate things. Is there anything more basic (and cool) than a white tank?
Sometimes the beauty of a look is its simplicity.
It seems cruel to actually have to get dressed in real clothes when it's so hot, but it can be done! Something this simple and cool can go from office to running errands easily. Over the summer I keep a cropped black jacket in my office to wear during work hours. It helps keep the look appropriate but also defends me against the blasting a/c.
I've noticed I'm wearing this skirt less and less, so I decided to wear it as simply as possible to let it do the talking for the outfit. I generally wear it dressier, so it's fun to wear it more casually from time to time.
Skirt: Halogen (Nordstrom, from the archives), Tank: Target, Necklaces: Charlotte Russe + JCrew, Shoes: Ann Klein