The shirt can be worn with the collar open or buttoned all the way up with the loop

If you're unfamiliar with Birkenstock sizing

Italian 8mm bio-circular Tortoise acetate

or to take the same size as their usual SL and ST size to achieve a more comfortable

Western Overshirt ~ Black color_indigo The shirt can be wornThe Western Overshirt is inspired by mid century western jackets and overshirts. Historically, these pieces would have been sewn in in a wool gabardine fabric but we've chosen a lyocell wool blend fabric that has the same drape as a traditional wool but with a softer hand and smoother finish. This overshirt features a longer collar, slanted chest pockets, and troca shell shank buttons. ! split! ! details! Model is 5'11" and 170lbs, wears a size Medium