Regalia; plural noun; the decorations, insignia, or ceremonial clothes of any office or order, or

rich, fancy, or dressy clothing; finery.

From What You Pawn I Will Redeem by Sherman Alexie : “So we headed over that way, feeling like warrior drunks, and we walked past this pawnshop I’d never noticed before. And that was strange, because we Indians have built-in pawnshop radar. But the strangest thing of all was the old powwow-dance regalia I saw hanging in the window.”

The word regalia means a clothing or something of the type that is used for ceremonial events such as graduations or in this case, a traditional Indian dance. The narrator, Jackson Jackson, saw a regalia in the window of the pawnshop.