Lederhosen
From Memory Alpha, the free Star Trek reference
Lederhosen (in English, "leather trousers") are a type of southern German clothing.
In 2354, at the Mazurka Festival on New Berlin, Benjamin Sisko danced in lederhosen, something Cal Hudson still found humorous sixteen years later, in 2370. Sisko claimed that he still had the hat. (DS9: "The Maquis, Part I")
The hat Sisko is referring to is called a Tyrolean hat.
