Black tie optional: For Men: Tuxedo: A classic black or midnight blue tuxedo with a white dress shirt, black bow tie, and black shoes is always appropriate. Dark Suit: A dark suit (navy, charcoal, or black) with a dress shirt and tie is a suitable alternative. Accessories: Experiment with different tie and pocket square combinations, but avoid overly bright or flashy colors. Shoes: Formal, polished shoes are essential. Consider: A stylish lapel pin or pocket square can add a personal touch. For Women: Evening Gown: Floor-length gowns in sophisticated colors are a great choice. Cocktail Dress: Knee-length or tea-length cocktail dresses in formal fabrics like silk or chiffon are also acceptable. Dressy Jumpsuits or Pantsuits: These can be a chic and modern option. Accessories: Statement jewelry, a stylish clutch, and elegant heels will complete the look. Avoid: Anything too casual, such as sundresses or casual sandals. Consider: Rich fabrics like velvet can be particularly glamorous for a black-tie optional event.