When you go to visit Hawaii, on thing that you will want to keep in mind is that Oahu is going to be the most civilized. You might want to visit this place first, so that you can get adjusted to the time difference and everything. and don’t just stay in the city.
When you go to a luau, sure, you might see someone in a grass skirt. But things do change in Hawaii just like they do everywhere else. Don’t go thinking that you will wear a skirt the whole time.
You are going to Hawaii, not a fashion show. Everybody there could care less what you wear. Do not worry about it.