Love this sweater!
I agree with the last reviewer this is a great cozy sweater. i took an xs regular and i am 5'6" 108lbs. the pin is used to close the sweater (no button). plenty of hand-knit sweater vests,wraps,shawls come with or are given with pins for closure. you will find many uses for the pin but as it is shown in the photo..... not likely.