Regalia (n) – special clothes and decorations (such as a crwon or scepter) for official ceremonies

Definition from Merriam-Webster (http://www.merriam-webster.com/dictionary/regalia)

From What You Pawn I Will Redeem by Sherman Alexie (Paragraph 6)

But the strangest thing of all was the old Powwow-dance regalia I saw hanging in the window.

As Jackson walked by the pawnshop that he had never saw before, it was strange because he saw an old Powwow-dance clothing hanging in the window and it was his grandmother’s regalia