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casual dress....aloha wear. comfortable and colorful. Cottons, rayons, linens, silks. leave your black attire at home. sandals and rubber thongs. plenty of places to buy t-shirts, jams and great hawaiian shirts.
I always wear a sundress to the luau and to dinner most nights. They are very casual on the islands and there aren't many restaurants where you can't wear shorts to dinner.
There are a number of places online that sell Hawaiian shirts, etc. Do a search on google.com. The Tommy Bahama line is quite nice, tho' a little pricey.