The islands settled on one word and the continent on another. Linda Arthur, a textile historian, puts a year on the split. The shirts were called aloha shirts from 1936 on, and mainlanders who took up the fashion simply called them Hawaiian shirts, probably because the concept of aloha meant little to them.
Then the shirt went to work. Honolulu let its civic employees wear sport shirts from June through October, starting in 1946. The Hawaiian Fashion Guild sent two of them to every member of the Hawaii House and Senate in 1962, and Aloha Friday followed in 1966.