Then & Now - Side by side screenshots of Original/Equipped/Unequipped costumes & Class Talent Grids (update Jan 25 2021 - Round 3 costumes added)

@Mr_Smile this thread should help

and copying the most relevant question. In summary:

  1. Each hero only has ONE costume
  2. You can switch between hero and costume
  3. You only use emblems on the base hero; when you use the costume, the hero keeps the same number of emblems but switches to the emblem of the costume
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