Another new costume has just been added to Super Mario Odyssey. You can now get the Spewart Hat and Spewart Suit, one of the Broodals that you battle in the game’s plot. Spewart’s Hat costs 1,500 coins, and Spewart’s Suit costs 3,000 coins. As of today, Mario has costumes for all of the Broodals. It will cost you a grand total of 18,000 coins to purchase all of the parts to all 4 Broodal costumes.
Source: Super Mario Odyssey