As the name suggests, these are different outfits that you can apply to your Unique named dragons to change their look! To access the costume shop, tap a unique named dragon (such as Toothless or Meatlug) and select the "Costumes" option. In the costume shop, you may purchase costumes as well as equip currently owned ones.
While some costumes are simply cosmetic, there are several other costumes that can provide a boost to your dragon's existing skills. For instance, a costume can provide a boost your dragon's fish and wood gathering ability! These bonuses will be listed in the costume shop.
 
Costumes can be obtained from several places, including but not limited to:
  • Costume Shop
  • Card Packs
  • Seasonal Market
  • Odin Market
  • Direct purchases at the end of a season
Note that some costumes have a level requirement, which will be indicated when selected in the costume shop.