Armor Trims 1.21.10 issues.

Hello, I'm trying to do a Dye Armor Trim datapack + resourcepack, and I have managed to clean up my resource json code so all 16 dyes have their item permutations. However, I'm stumped figuring out getting the dye to actually get applied to the Armor.
Eventually I want to make a Full-Dye Trim, but I just want to get the dye to work first.
Just for context, Sanctuary_Dimensions -> sanctuary is the Datapack, and Sanctuary_Source -> sanctuary_resource is the Resourcepack.
I tried copying the 1.21.10 Armor and Blocks Atlas, and made sure all item model code has all 16 dye permutations under the sanctuary_resource name to separate it from the Data's Namespace.
I have been trying this myself, but all I got is to make Dyes enter in the Smithing Table, and for all armor pieces to not be missing item textures. All Vanilla Armor Trim Materials work properly.