smallbitA vast majority of aloha shirts out there are made in 100% cotton fabric, and those are usually made in Hawai'i, specially when they're from legit brands like Avanti.
The silk ones have to be made in China because that's where 90% of the world export market of silk comes out of, and although there's discussion about who has the best silk (China vs India vs Thailand)... China has been doing it the longest.