resort shirt
 
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Her husband had a taste for loud Hawaiian shirts.
I saw two large men clad in khaki shorts and Hawaiian shirts.
The photo shows him looking relaxed in a Hawaiian shirt and sunglasses.

SMART Vocabulary: related words and phrases

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

Examples from literature

But Hawaiian shirts are just one part of surfer fashion. 

Hawaiian shirt | American Dictionary

Hawaiian shirt
noun[ C ]
us/həˈwɑɪ·ənˈʃɜrt, -ˈwɔɪ-/
a loose, informal shirt with colorful patterns on it