Speaking of the armor stands, I think leather armor in standard kits should be dyed the same color on the field as on their display so you can tell them apart better in the field (also they'd look cooler). In turn, this would also allow people to distinguish between custom kits and regular kits since all the custom kits would then have black leather.
I noticed this same principle applies to elytra kits. When they aren't in use, they're replaced with a purple leather armor piece.
I bet AoE's probably gonna say this'll be added in a future update, but I just wanted to throw it out there.