When I just want to keep things simple and classy, I refer to my favorite trio of red, white, and black. Those three colors together work so well and give off a very Audrey Hepburn vibe when worn right. Audrey was my inspiration when I wore my black waterfall dress from Chicwish and accessorized it with pieces from my closet: white heeled sandals (worn previously in Monaco), a white clutch (used previously in Monaco), and round sunglasses (worn previously in Los Angeles).
Dress by Chicwish. Shoes by Chinese Laundry (similar here). Clutch by Reiss. Sunglasses by Prada via OPTX Eyewear (also available here and here). Lip color from RMS Beauty.
Some of my other favorite dresses from Chicwish: