size  IS medium,new old stock. made in USA BY GOODWILL OF SOUTH FLORIDA  .a government contractor, hand measure arm pit to arm pitch 25" back of neck to bottom of JACKET28" IN THE FRONT AND32"  I MADE IN 2010,NSN 8415-01-538-6742,SPM1C1-10D-N011

if buying more than one item of any type, buy as much as you want,DO NOT PAY UNTIL YOU TELL ME YOU ARE DONE, AND I SEND A REVISED COMBINED POST AND HANDLING INVOICE. the ebay calculator is not always correct.