(PS I know there are some already inspired cultural costumes/armors in sk)
But it would be more interesting and stimulating to have more of them ,so that you can expand the variety of costumes without having to create multiple reskins of the same costumes every time a promo comes out.

For example those spiraltail mails and accessories are a small content but they are pretty dope and as a player that barely plays ,that type of creative artstyle is the things which pulls me back to play the game.
Since artstyle is a strong point of this game,play around with it ^^,the design team is capable of creating really creative ideas so why not put them into the game?,add more variations in designs, eg make a cold iron vanquisher costume/armor which is given as a reward to knights who complete a certain level and they will get an achievement of such as the fiend slayer by accomplishing a tough arena full of different types of fiends enemies etc..
and as time goes on this will give you time to work on the game while the players are distracted with this new challenge which wont take much time to program since you are mostly using current assets in the game.

That's my thoughts no hate/rant towards OOO.