While spending hours on various street style sites, I've come to a number of conclusions about things that are acceptable in various parts of the United States. First, various states of undress are mostly acceptable in California. People won't blink an eye at butt cleavage, peek-a-boo flimsy bras, sheer netting over crochet skirts, etc. None of these things will pass in ATL. (From personal experience, 5" Alexander Wang hooker heels will get you raised eyebrows. Also, so will pink pleated skirts.)
Taking my favorite summer staple, a Victoria's Secret slip worn as a dress, I've made it brunch appropriate with your grandmother. For the transition, I replaced the slip on mules for the dressier Chloe wedges, added a blazer with a splash of color, and swapped the grotesque, chunky jewelry and leather accents for southern-approved pearls and ribbon accents for a softer look.
top. lace crop by Pencey / dress. black slip by Victoria's Secret / shoes. mules by Alexander Wang / assorted jewelry / sunglasses. Chanel
top. turquoise crop top by Topshop / blazer. Zara / shoes. Chloe