This is a complicated piece.  While marked as M-4395 on the inside of the neck, there are plenty of measurements that could possibly equal a good fit with these coveralls. Some of the snaps are plain and unenamored while some of the buttons have the 13 star adornment.  

Marked Size: N/A
Chest: 42"
Sleeves: 22"
Shoulder: 18"
Length: 33" to crotch
Waist: 35"
Rise: 11.5"
Hips: 45"
Inseam: 29"

Item is for sale at Barn Owl Vintage Goods in Georgetown. Seattle's Home for Vintage Frogskin Coveralls!  Every attempt has been made to document every flaw, but we are, alas, human so there exists the possibility we have not gotten everything.  All sales are final.  No refunds or exchanges.