I have shorts but dont wear them much anymore. If you have ample back then when you sit, the rise rides up and cuts your crotch. OUCH... THAT HURTS!
I have really short skirts as well, but when the weather is super hot there is nothing more uncomfortable than sitting bare-assed and sweaty on a chair. I tend to wear very long clingy skirts in very hot weather so when I sit down I am not uncomfortable and I think a long clingy skirt (especially when you have a nice round bootay) is dead sexy.
Sorry, it this isn't what you wanted to hear.
Been looking for some cute sundresses but haven't been able to find any that I like.