Help with custom armor model

Im wanting to make a custom armor model that looks like a minecon cape. i made a custom java model for it with BlockBench and when i link it with my armor in mcreator i get this:

https://www.dropbox.com/s/ytgq6e2jtqoxy66/2020-03-14_23.38.02.png?dl=0

this is what it looks like in Blockbench:

https://www.dropbox.com/s/g3osz6upw9ugv8o/BlockBench.PNG?dl=0