That upside-down pocket on your pants is a purpose-built tool pocket. It runs down the leg and opens at the bottom so a long, slim tool slides in from below and stays clamped against your thigh. The handle end sits where you can grab it.
So it isn’t a factory mistake. It isn’t a decorative seam, and it isn’t a slot that some designer forgot to finish. I know the confusion, because the first time I turned a pair of work pants inside out at a store, I stood there frowning at an opening that seemed to point the wrong way. My honest first thought was that the pants were defective. They weren’t.
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The part most people get wrong is assuming a downward opening makes the pocket useless. There’s even a running joke online about people trying to stuff a banana in one and watching it drop straight
