I don't think they ever sold it on steam.
I assume this content was supposed to be FREE on their own store as a way to promote their store (at least this is how I got it)
https://www.bandainamcoent.eu/vipcorner/get/slug/dlc-dragon-ball-xenoverse-movie-costume-pack-for-pc-steam
6 years ago
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Dragon Ball Xenoverse - Movie Costume Pack
2 CS:GO/TF2 keys , offers
Its DLC for the game DRAGON BALL XENOVERSE ( http://store.steampowered.com/app/323470/ )
it was removed from the steam store , it was available for a limited time.
Its a key
https://steamdb.info/app/362600/