Sigmund Freud vintage, Large, Blue shirt

found this shirt deep in my dads closet. I dont know what it is, but it looks like it was cool at the time. says Large, but looks like a today's Medium. dimensions: 19" arm pit to arm pit. 26" neck to bottom. 15.5" neck to sleeve Has a super fun/weird seem that goes around the neck. the white seems look tatered but they are all still there, none are missing. zero cracks on the graphic.