Hello there! I'm making an addon/connector between Epic Knights and TerraFirmaCraft, and I've already done initial release but now while working on retexturing Epic Knights' armor to match with TFC artstyle I've encountered a problem which is in the title. I tried to replace a vanilla armor with my texture and it worked. I tried to replace items from Epic Knights and it worked. I tried to replace armor in both TerraFirmaCraft and Epic Knights and it did not work. Any help woukd be appreciated.
Btw resourcepack works and replaces armor just fine. But I don't want to use it.
https://imgur.com/a/Hvd9Faq here are all the screenshots