Modding Help Purchasable items with color indexes

Hey, so I have been trying to add a shop that allows one to buy clothing items with their own color indexes. Under the object's interact data, I have used the following code:
"items" : [
{ "item" : { "name" : "dragonhorn1" },"parameters" : { "colorIndex" : 3 } }
]
But in game, the clothing items are all one color. Does anyone know how to add color indexes for object stores? Does anyone know if it is even possible?