Mii Fighter Costumes

In Super Smash Bros. for Nintendo 3DS and Wii U and Super Smash Bros. Ultimate, Mii Fighters are able to be customized with different outfits. The following is a list of different hats and outfits a Mii Fighter can equip. The games will also include DLC hats and outfits.

Headgear
Many of the hats that were in the original game were based off of hats present in the Streetpass Mii Plaza.

Outfits
There's 4 kinds of outfits: one exclusive for each Mii category and that whose can be used for all of them.

Mii Brawler Outfits

 * Biker Gear
 * Fighter Uniform
 * Mecha Suit
 * Protective Gear
 * Standard Outfit
 * Tracksuit
 * Vampire Outfit
 * Smash T-Shirt
 * Smash Hoodie
 * Business Suit
 * Bionic Armor
 * Akira Yuki Costume (Virtua Fighter)
 * Jacky Bryant Costume (Virtua Fighter)
 * Heihachi Mishima Costume (Tekken)
 * Flying Man Costume (EarthBound)
 * King K. Rool Costume (Donkey Kong)
 * Captain Falcon Costume (F-Zero)
 * Toad Costume (Super Mario Bros.)
 * Knuckles Costume (Sonic The Hedgehog)
 * Team Rocket (Pokemon)

Mii Swordsman Outfits

 * Cybernetic Suit
 * Neon Suit
 * Ninja Outfit
 * Pirate Outfit
 * Plate Armor
 * Samurai Armor
 * Standard Outfit
 * Smash T-Shirt
 * Cat Suit
 * Smash Hoodie
 * Business Suit
 * Link Costume (The Legend of Zelda)
 * Dunban Costume (Xenoblade Chronicles)
 * Zero Costume (Mega Man)
 * Lloyd Irving Costume (Tales of Symphonia)
 * Chrom Costume (Fire Emblem)
 * Black Knight Costume (Fire Emblem)
 * Hunter Mail (Monster Hunter)
 * Rathalos Armor (Monster Hunter)
 * Viridi Costume (Kid Icarus)
 * Gil Costume (Tower of Druaga)
 * Ashley Costume (WarioWare, Inc.)
 * Takamaru Costume (The Mysterious Murasame Castle)

Mii Gunner Outfits

 * High-Tech Armor
 * Wild West Wear
 * Fancy Suit
 * Steampunk Outfit
 * Dragon Armor
 * Mage Outfit
 * Smash T-Shirt
 * Bear Suit
 * Smash Hoodie
 * Business Suit
 * X Costume (Mega Man)
 * Proto Man Costume (Mega Man)
 * Isabelle Costume (Animal Crossing)
 * Inkling Costume (Splatoon)
 * MegaMan.EXE Costume (Mega Man)
 * K.K. Slider Costume (Animal Crossing)
 * Samus Aran Costume (Metroid)
 * Fox McCloud Costume (Star Fox)
 * Geno Costume (Super Mario Bros.)
 * Tails Costume (Sonic The Hedgehog)
 * Sans Outfit (Undertale)
 * Cuphead (Cuphead)

Downloadable Outfits
Currently, six downloadable bundles have been released. Each costume can be purchased separately, costing $0.75 for one version and $1.15 for both versions, with the exception of K.K. Slider, which is free with Patch Update 1.1.0.

Bundle 1
Bundle 1 was released on April 15, 2015, costing $6.00 for one version of the game and $9.20 for both.

Bundle 2
Bundle 2 was released on June 14, 2015, costing $6.00 for one version and $9.20 for both.

Bundle 3
Bundle 3 was released on July 31, 2015, costing $6.00 for one version and $9.20 for both.

Bundle 4
Bundle 4 was released on September 30, 2015, costing $5.25 for one version and $8.05 for both.

Bundle 5
Bundle 5 was released on December 15, 2015, costing $1.50 for one version and $2.30 for both versions.

Bundle 6
Bundle 6 was released on February 3, 2016, costing $4.50 for one version and $6.90 for both versions.

Trivia

 * The store image for the Akira outfit features a Mii Brawler battling a Metal Wii Fit Trainer. Her metal appearance here is a reference to Dural, the final boss of every single Virtua Fighter game to date (with Dural's appearance always being that of a metallic woman).
 * Ryu's reveal trailer ends with him clashing with a Brawler dressed in the Heihachi outfit, referencing the earlier crossover fighting game Street Fighter X Tekken. Mega Man and Pac-Man were also playable in that game, albeit with Mega Man in a more comical form and Pac-Man riding a hollowed out Mokujin.
 * The store page for the Lloyd outfit features a shot of a Mii performing the Chakram special move while wearing the outfit, referencing Lloyd's close friend Colette, who also fought with Chakram as both slashing and throwing weapons. Another shot shows a Lloyd Mii with brown eyes standing next to another Mii dressed in the full Lloyd set but with blue eyes. The blue-eyed Lloyd Mii may be a reference to Decus from the sequel Tales of Symphonia: Dawn of the New World, who disguised himself as Lloyd, and had blue eyes in his undisguised form.