VINTAGE DIANE VON FURSTENBERG Plaid Button Up

Diane Von Furstenberg blue and green plaid button up. Sleeves are baggy & generally is a baggy fit. Please see all pictures. Excellent used condition. There is no size tag on it but the measurements are (Laying flat) : Length: 27.5 Armpit to Armpit: 20 Arms: 20. I would say it's a medium.