VINTAGE Eastern Airlines Shirt Mens Medium Uniform Blue Workwear Costume?

Vintage Eastern Airlines uniform Work Shirt (no size tag) Blue workwear Perfect for a costume Freshly washed. There are some grease or stains that I show on the last photo. Name on the inside is Sherrill So sizing would say it is a medium but check your measurements Approximately 21 pit to pit 21 in sleeve inseam 29 in shoulder to hem