/cgl/ - Cosplay & EGL

Any suggestion for full-torso female body armor? Like Saber's one from Fate/Stay. I'm making one for Starguardian Poppy and I want to make it less bulky and barrel-like than usual EVA form Saber's armor. I had an idea to use 2-layered worbla and a plastic manequin in my swize as a mold and make a form with it but have two questions.
1. How to swift worbla around mold that big and relief? I'm not sure it's possible to form the boobie cups and other parts of armor from one list of worbla without streches.
2. How to make a full armor (not just the front side as in most of female armor WoW-like which are basically just armored bra) and make a back side too since this costume doesn't have any cloak to cover the back side?