AshijinColor Tinting allows you to make cosmetics where the user can choose which color they want it to be while wearing it by using the /cosmetic dye command.
To use this feature, the cosmetic must be a colorable item type (such as leather armor, leather horse armor, or potions). Then you can simply add Colorable: true to the cosmetic's configuration file.
Coloring Cosmetics
Currently the only way to apply a color to a colorable cosmetic is by using the dye command:
/cosmetic dye [type] [color]
For example, /cosmetic dye HAT #FF0000 would dye the hat you're wearing red if it's a colorable item!
More options for coloring items are coming in a future update