Muumuus, which are traditional, loose Hawaiian dresses, are the perfect apparel choice for luaus. A muumuu dress is light and flowing, doesn't restrict movement, and gives the wearer maximum comfort.
One last note about respect; and please, we cannot emphasize this enough: Unless you are Hawaiian or are very intimately familiar with the culture, do not throw or attend a party deemed a “luau.” Culture is an identity- not a party theme.
Anyone can wear an aloha shirt without risking offense to Hawaiians. Hawaiians didn't invent them; they didn't exist until well into the 1900s, and were originated (reputedly) by a Chinese merchant based on colorful Japanese prints, in a Honolulu dry goods store.
Don't remove sand from the beach. A small container of sand sounds like a cool souvenir, especially if taken from a black- or red-sand beach, but doing so is considered bad luck. ...
Don't take any lava rocks from Volcanoes National Park. ...
Pack versatile clothing that you can mix and match, and dress up and down. Leave your denim at home! Denim feels so hot and bulky in the tropics. You will be much more comfortable in cotton or linen shorts or pants.