So you can achieve this look in two ways.
1) If the shirt you are working on already has a pocket, you just cut the fabric you're using for the accent pocket to match the same shape.
2) Use the fabric glue to attach the accent fabric to the shirt.
3) If you're using a button down shirt that doesn't have a pocket, you can take another shirt that does and use that shirts pocket as your outline for the fabric you will cut out. Then just use the fabric glue and paste it onto your shirt.
Check out more fun DIY projects at the Home & Family Pinterest Page