Do I need a rain jacket?

Yes, but keep it ultralight. Caribbean showers are often short and heavy; a thin, packable rain shell or a quick-dry poncho is better than a bulky umbrella.

Are formal clothes necessary for cruises or resorts?

Rarely. Even at upscale resorts, 'island formal' is usually just a clean shirt and linen pants. Avoid heavy fabrics and dark colors that absorb heat.

What to pack for a Caribbean vacation

Prioritize breathable natural fibers like linen and cotton to handle high humidity, and pack at least two swimsuits so one is always dry. You only need one light layer for air-conditioned interiors and two outfits for evening dining.

Select your fabrics. Stick to linen, light cotton, or moisture-wicking synthetic blends. Avoid denim, polyester, or heavy weaves, which trap heat and take forever to dry in tropical humidity.
Plan for sun protection. Bring a wide-brimmed hat with a chin strap (it gets windy on boats) and high-quality polarized sunglasses to handle the intense Caribbean glare off the water.
Prepare for the evening. Most resorts require 'smart casual' attire for dinner. This means a sundress or linen trousers and a button-down shirt. Leave the formal blazers and heavy heels at home.
Pack your footwear. Bring one pair of waterproof sandals for the beach, one pair of comfortable walking sandals or sneakers for town, and one pair of dressier flat sandals for dinner.

Do I need a rain jacket?: Yes, but keep it ultralight. Caribbean showers are often short and heavy; a thin, packable rain shell or a quick-dry poncho is better than a bulky umbrella.
Are formal clothes necessary for cruises or resorts?: Rarely. Even at upscale resorts, 'island formal' is usually just a clean shirt and linen pants. Avoid heavy fabrics and dark colors that absorb heat.