frostline kit down jacket size ? vintage usa made

frostline jacket size unknown
vintage pre-owned, 
typical wear
*sold as-is, not perfect
down insulation is clumpy in some places (after washing), and will need to be repuffed by new owner
SIZE? (no tag, dimensions are provided... i hope this helps)
armpit hem line to line = 20"
waistline, across = 19.5"
front:  neck hem line to bottom = 23.5"
back:  neck hem line to bottom = 28"