In server only have a regular costume right?, I would like to suggest you to add new Animated Costume, So the price is must be higher than the regular one, So the animated costume should be moving right?, Like if the animated costume have a dragon animated costume, so the wing must be animated/moving, or some kind of fire, Maybe you can add some particles on the skins. Really Hope You Can Add The New Animated Costume.
So looking at this suggestion, personally I think its pretty cool. The idea of animated costumes will make it really unique.
Personally I would say that you should not be able to buy these in-game but should be a reward for maxing out a game on the hive instead to make them even more rarer
Also, when you stand still and they have an idle animation or something would look cool imo