It being constructed of all-natural fibers, it has shrunken over time and fits now more like a size medium. The sleeves are slightly shorter than most modern tees and this shirt has a great biker aesthetic to it because of this stylized fit. Check out specific measurements below to help with sizing. 

Measurements
19.5" pit to pit / 39" chest
27.5" long
18.5" shoulder to shoulder

This shirt does have a couple holes, on larger quarter-sized one on the back. As much as we would consider that a flaw by modern clothing standards, it really makes for a nice, authentically-worn, look.

Machine wash cold tumble dry low heat inside out. Shirt may shrink if you dry it with heat.