Hawaiian shirt
Outside of the office, he's comfortable in casual linen and a beach shirt.
All I pack is two beach shirts that I have taken on vacation for the past 10 years and a pair of flip-flops.
Two young guys in beach shirts and flip-flops drove by in a golf cart.

SMART Vocabulary: related words and phrases

Jumpers, shirts & tee-shirts
bandeau
blouse
bodysuit
boob tube
bow blouse
dress shirt
gansey
golf shirt
guernsey
hair shirt
polo neck
polo shirt
polo-necked
pullover
resort shirt
tube top
tunic
turtleneck
turtlenecked
twinset