Hawaiian shirt
A Hawaiian shirt was a style of collared dress shirt originating from the island chain of Hawaii on the planet Earth. They were extremely colorful, short-sleeved, buttoned-down shirts, usually – but not necessarily – with a prominent floral design. 

They were worn when off duty, usually in the context of a real or simulated vacation.  threw on a Hawaiian shirt prior to disembarking for shore leave on Risa in 2152. () 

Similarly, Tom Paris was seen in several different Hawaiian shirts while on board . One such occasion was when the Voyager crew fêted at a luau. Harry Kim also wore a Hawaiian shirt in 2373, one with a pineapple motif. ()

Several victims of delta radiation exposure at the Farm on Endicronimas V wore Hawaiian shirts in 2380. ()

In 2381, Brad Boimler wore a Hawaiian shirt and a lei to socialize with a group of other officers who were also claiming to be from Hawaii. After the  came under attack by Pakleds and Klingons, he exclaimed, "I don't wanna die in a Hawaiian shirt!" ()

See also 
 Big Daddy-O Surf Special

External link 
 

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Clothing