For those seeking an über-cool alternative to a wedding-guest dress, look no further than the versatile evening jumpsuit. Combating the fatigue of festive frocks, these sleek styles—rendered in luxe fabrics like silk, satin and crepe chiffon—are insanely chic and unexpected for formal events. For the ultimate fashion-girl ensemble, opt for styles with added interest such as an asymmetrical neckline or structural ruffles and team with standout heels and statement jewelry. The best part? You can get extra mileage out of the all-in-one with sandals and a polished ponytail on the weekend. Ahead, 18 takes we highly suggest taking for a spin this wedding season.