That's a ballistic vest with the kevlar/trauma plates removed and a funky collar installed on it.
You can see the MOLLE/PALS loops all over it and the drag handle on the back.
My friend Roger at Custom Tactical Creations makes vests like this for a living, all custom made to your specs, built for real world use too using genuine Cordura nylon.
Heavy duty stuff, might want to check him out.
Can you provide any pictures and/or links?? Would be nice to find this and simply modify it slightly rather than having it custom built from scratch - but if it comes to that, Indy knows what he's getting himself into.