CRZ YOGA V Neck Maxi Tank Dress for Women - Adjustable Straps Sleeveless Flowy Casual Outfits with Two Side Pockets

This! https://www.amazon.com/CRZ-YOGA-Neck-Dress-Women/dp/B096ZJF2V3/ref=ast_sto_dp_puis?th=1&psc=1 I have the exact same thing in black from Athleta. I bought it a few years ago - super light, easy in extremely hot weather but can also be layered. It is the least fussy dress ever.