What he said ^^^ vapor barrier still desired,
look at Stevenson's Warmlight, a 4 season back country gear
small cottage manufacturer in NH..
it is the liner base layer .. they have a custom fabric they sew into under-things


My winter Parka Came From Carhartt, its a zip and snap closure .
and big enough to layer under it.

ANSI reflective striped and Neon Lime , because It gets Dark Early, now.

Ill go back to my Shower's Pass Portland Jacket when the clocks spring forward.