Since barbecues typically celebrate summertime, dress in light, colorful clothing. Throw on a Western shirt, a straw hat, bright shorts or sandals.
You can embody the Palm Beach aesthetic of Lilly Pulitzer with pinks and aquas, or go more surf-casual with flip-flops and jams, dude. Do it up in gingham by dressing in red-and-white-checked everything to channel your inner Ellie May. Be sure to bring warmer items like sweaters or wraps, since it can get a little chilly after sundown.