From Trend Patterns:
The shirt range explores a wardrobe staple, traditional shirts with a twist. Many designers regularly feature a shirt within their seasonal collections combining traditional elements with the themes within the main collection, giving the customer a designer edge to their work to weekend wardrobe.
The Angel Wing Shirt is named after its oversized sleeve. The traditional elements are a front placket, a curved shirt style hem, and a cuff reminiscent of a cuff-linked men's shirt. At the neck the collar is a narrow stand only for a clean minimal look, keeping the focus on the sleeve.
Easy - Moderate. This pattern has a simple placket in the front and minimal features in the body. All the detail is in the sleeve, and that's just a lot of gathering.