I used two shirts for this top, the right way up. Both the shirts were partially buttoned together on the centre front and centre back. The sleeves were wrapped around the body to draw in some of the fullness. (The sleeves would need additional button and buttonholes on the front and back, to keep the sleeves in place). The gathered fullness at the shoulder was created by ruching up the back of the shirt, these would require small bar tacks to anchor the ruching in place.