Pocketing is actually a rare service that allows one to add a pocket to a non-pocketed item. What makes this service so rare is that fact that a second item usually needs to be created to create a new item profile to have the pocket. It has been stated in the past, that this usually requires QCing.
When offered, it is usually done by script, there for the item you wish to get pocketed must not have any scripts on it.