They're everywhere. In fact, a nice button-up collared aloha shirt is considered formal wear in a lot of places on the islands. So yes, you will see locals (traditionally men, but women too) wearing all sorts of aloha shirts ranging from sun-faded vintage to custom-fitted patterns.
What do you wear to a luau in Maui?
Well, it's a party. So, the dress code is casual, and the focus is on being laid-back. If you're a guy, you can opt for a Hawaiian shirt – you can never go wrong there – and if you're a girl, the obvious choice for a Luau would be a Hawaiian-style dress. You can keep it long and flowy, if that's the mood you're in.