Editing Textures covered_horse and surcoat armor

[TuranianGhazi]

Hi,

This is from 1257 mod but may be applicable to other textures of armors as well.

Q. I have the custom player surcoat and the custom player horse but the surcoat is white and the horse is black...
A. These are placeholder textures for you to overwrite with a design of your own or one of the existing rnd_*.dds textures.  The surcoat texture filename is player_surcoat.dds, the horse covered_horse_player.dds and they are located in the module's Textures directory.

Does anybody in the community know how to edit armor textures? I already have template files to work from but I'm unsure how to add my custom banner's design onto these? How to make the rectangular banner fit into the contours given to me?

Thanks!