During cocktail hour and beyond, when it comes to getting dressed, almost anything goes. To turn heads while out on the town, show off your sense of adventure by taking a fun, care-free approach to color. Opt for a solid-colored shift in a brilliant hue and accessorize with equally vibrant pieces including the season’s essential clutch. To keep things from getting too crazy, stick to fuss-free flats. And remember—thanks to these designers’ rainbow brights, you can be bold without saying a word.—Susan Cernek