Washington ? Move over, ruby slippers. That puffy shirt’s moving in.

The outlandishly unfashionable shirt worn by Jerry Seinfeld on his hit TV show went on display Friday at the Smithsonian, alongside Kermit the Frog, Archie Bunker’s chair and Dorothy’s magic slippers from “The Wizard of Oz.”

Actor Jerry Seinfeld is flanked by Smithsonian American History Museum Director Brent D. Glass, left, Thursday as he donates his puffy

At the end of its nine-season run, “Seinfeld” — the “show about nothing” — left lots of well-loved lines but few tangible relics suitable for enshrinement in the National Museum of American History.

Thus, The Puffy Shirt, which appeared briefly in a single episode. What makes that bit of wardrobe so memorable is that it serves as an icon, not only of “Seinfeld” but American popular culture.

“It looks funny and it sounds funny, and that’s a good combination for a joke,” Seinfeld told The Washington Post at a donation ceremony Thursday night. Before the puffy shirt episode aired in 1993, Seinfeld said, he had no idea it would become a classic.

“This might be the first joke inducted into the Smithsonian Institution,” Seinfeld noted.