If you cannot live like a white wine swilling wealthy housewife, why not dress like one? I have said it before: dress for the job you want.
Along with caftans, tunics are the ideal article of clothing to keep cool on a roasty toasty day. They are perfect over swimsuits in between daytime dips in the pool or with a pair of white denim while sweating it out on the sidewalks. White wine goblet optional.