I recently had some MTM odd trousers made by Q Clothier in Dallas. I thought they did a lovely job, and am one happy customer. One surprise they added (I didn't request it) was a roomy hidden trouser pocket, accessible right along the waistline, as shown below. My fingers have slid into the pocket in the photo. Is this usual practice in the MTM/Bespoke world? And if so, what might one carry in this pocket?