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Beach Semi-Formal/Cocktail A dress, suit, formal romper, or jumpsuit all work for semi-formal. Feel free to include prints, avoiding anything too loud. If you choose to wear a beachy dress, consider it in either tea-length or maxi to avoid looking too casual. Dressy sandals, chunky heels, and wedges are acceptable footwear options. While a jacket isn’t required, a breathable sport coat or unique blazer is a fun addition. Feel free to include prints, avoiding anything too loud. Shoes can be a little more casual, but still need to be closed-toe, such as a loafer or deck shoe.