Wren Shirt + Blouse Pattern by Chalk and Notch. Difficulty: Intermediate. Sizes: 0-30 The Wren pattern is a button-front blouse and a mini dress. The mini dress has a dropped waist with a gathered skirt and is loose through the waist and hips. There are two statement sleeve options. A short sleeve with a puff cap and an elastic hem and a long sleeve with a cuff. CAN41804