A fabric receptacle built into a garment. Pockets can be patch (sewn flat onto the outside), inseam (hidden within a structural seam), or welt (set into a slit with finished edges). They require careful structural reinforcement at the corners, often using bar tacks, to prevent the weight of carried items from tearing the host fabric.
Heard on the job
Reinforce the top corners of that patch pocket so it doesn't rip when the customer shoves their hands in.