1. it's not a missing feature

2. the game tells u explicitly that this costume isnt available in battle

3. even if you didnt see that notification in game, it's your own responsibility to find out before buying

4. literally everyone was crying about this when it first came out you'd think some of the knowledge would have trickled down or something...

5. i'm sorry how does missing battle clothes make a game "literally unplayable" it's just skins?

6. in conclusion you only have yourself to blame sorry