SG Layering Q

[slick]

Has anyone put a Kifaru LPP or SG Grumman underneath an M7 jacket?

Wondering if I should order a L or XL M7?

The Kuiu systems nestles together nicely. (i.e., large Kenai under large Kutana) but due to the bulk of the increased syn insulation in a LPP (or grumman down jacket) I'm wondering how SG clothing line would fit with the same size from another company?

 

[WeiserBucks]

Grumman isn't very thick, I'd layer a L under a L M7.