Trouble With Layered Clothing

I recently made a wingsuit that I intend to convert into layered clothing for my game. However, I’m very new to layered clothing and I can’t get it to work.
Outer Cage:


Inner Cage:

Studio Result:

I created the armature by importing the Roblox R15 armature from studio and then positioning it on my wingsuit. I created all the necessary loops so that the armature can properly twist and bend the wingsuit. How do I make my wingsuit into layered clothing? Any help would be very, very appreciated.

did you follow the instructions in the offical roblox documentation?

(Is the suit weightpainted?)