Problem with custom armor model

Okay so I have this model:
 

I made it in Blockbench, exported as .JAVA, here's how texture looks like: https://i.imgur.com/IIQRjNe.png
Also here's how it looks in Blockbench:

Now, I did everything as it is explained here: https://mcreator.net/tracker/issue/50791

But in game my model looks like this:
 

Any ideas how can I fix this? :/ Im kinda lost at this point.