https://www.polygon.com/2018/12/28/18159141/super-smash-bros-ultimate-dlc-mii-fighter-costumes

Super Smash Bros. Ultimate downloadable content will begin to rollout early next year, and it will consist of more than the previously announced fighters pass collection. Nintendo’s support site indicates that Mii Fighter costumes will also be in the mix, sold separately from the larger downloadable content bundle.

These 75-cent purchases will include a single costume for the game’s Mii Fighters, which are customizable characters that players can design from head to toe. There are already plenty of costumes available to purchase and collect throughout the game, ranging from unique headgear to outfits based on existing characters. But just as Super Smash Bros. for Wii U before it, Ultimate’s catalogue clearly has room to expand.