IF you want a CLIENT-SIDE cape to display when you equip a cape, open the file in the directory:

\<resource pack root>\subpacks\<your subpack of choice>\entity\player.entity.json

Scroll down to the bottom where it says "render_controllers".



`//{ "controller.render.player.cape": "query.has_cape" },`

^^ remove these to forward slashes "//"



Then, go to the directory:

\<resource pack root>\subpacks\<your subpack of choice>\textures\entity\cape_invisible.png


You will see an image of a turtle cape as a sample. You can replace it with whatever cape you
want, but make sure it has the same file name. 




Do NOT contact me about "fixing" or troubleshooting capes in any way. I have neither the time nor
patience to walk you through it.

-ambient