A little false pocket on the back of pants adds a great, simple detail. Spend an extra 30 minutes on this one, you'll be glad you did! While it is easiest to attach the pocket before assembling the pants, it is possible to add them to existing pants.
This pattern is intended to be for child sized pants but can easily be enlarged for larger sizes. If you are reading this in your feed reader you will need to click through to get the pattern.