The Schoolhouse Tunic from Sew Liberated.
This pattern lets you make a tunic to wear as a dress or over jeans - or make a shirt. Features front and back pleats, 3/4 length sleeves with optional elastic gathering at the cuff. Open bodice perfect for layering. Women's sizes 2 thru 20.
Fabric required is 2.4 to 2.9 yards depending on length of shirt/tunic.