You can try Elmers Ruber Cement. We used to put it on the fingers and palms of our gloves when i did Cerimonial Drill. It sticks to wood and metal really well and would probably give you some grip on the inside of your pocket. It comes with a small brush. Just brush it on where you want it and let dry. You can add more layers where needed and you can also reapply if it wears down. The plus side is its like 2 dollars at Wally World.
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