Actually, if you're willing to make a sojourn into the Juniors section, knee length shorts are in *cue religious music*. Dept. stores often carry up to a size 14 equivalent, but they fit differently.

Also, swim shorts for women!:
here (http://www.llbean.com/webapp/wcs/stores/servlet/CategoryDisplay?page=jogger-shorts&categoryId=49122&storeId=1&catalogId=1&langId=-1&parentCategory=8067&cat4=3028&shop_method=pp&feat=8067-tn)