Aloha Shirt

This character wears an Aloha shirt.

The Aloha shirt, commonly referred to as a Hawaiian shirt, is a style of dress shirt originating in Hawaii.
The dress shirts are short-sleeved, collared, button up shirts that are printed with colorful patterns, usually of flowers or other plant life. Aloha dress shirts usually have a left chest pocket sewn in, often with attention to ensure the printed pattern remains continuous. The lower hem is straight, as the shirts are not meant to be tucked in.