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From Terraria Wiki
The Sailor Costume is a vanity set that includes the Sailor Hat, Sailor Shirt and the Sailor Pants. The items are all meant to be equipped in social slots as they provide no bonuses other than looking spiffy.
All three pieces can be dropped by the Pirate Deckhand, Pirate Deadeye, and the Pirate Crossbower with a chance of 0.2% or 1/500 chance for any piece. These enemies can all be found during a Pirate Invasion.