William Ellery Postal Shirt This is a modernized version of the 1960's USPS uniform shirt, and is the standard issue Expedition Society Button-up. While we modernized the fit, we have kept the reinforced shoulders that were original developed to protect from daily carrying bags of letters.  We intend to produce gear that works in the field, and looks good enough to present in front of the UN.  Sizes are by chest measurement. Fit is slightly roomy for improved mobility. Removable collar stays. 100% Japanese Cotton Made in USA S: chest 44”, neck 15”, sleeve 34”M: chest 48”, neck 16”, sleeve 35”L: chest 52”, neck 17”, sleeve 36”XL: chest 56”, neck 18”, sleeve 37” We recommend sticking true to size, as cotton shrinks with wash.