100% cotton. Muslin fabric. Full button fastening. Two chest pockets. Buttoned cuffs. Curved split hem. Regular fit. Named after ‘Old Rumple Eyes’ himself Robert Mitchum, the Y.M.C. Mitchum shirt is a shirt of the long sleeve variety. And thanks to that perma-creased muslin fabric, it sort of does look like Mr. Mitchum’s eyes… if you squint, of course.