I know you won't be offended if I use you as an example T. Your pics in the hat contest with the red fez. In one you are standing with hands behind your back. Pose might not be the most creative but shows how well your jacket fits. In another you have both hands in both jacket pockets and it just pulls your jacket fronts all out of line. It's not about treating the jacket with delicacy or whatever, just looks off to me.
Where do I keep my stuff? What stuff?
If I don't have a jacket, phone goes in rear left trouser pocket, wallet in rear right, keys in front left, handkerchief in front right. Sunglasses on face or if indoors then in shirt front.
If I'm wearing a jacket / suit, sunglasses go in breast pocket, phone in inside pocket. Everything else the same. I don't feel a need to carry a bunch of other stuff around. Wallet is as slim as possible. Two keys on the ring for car and door. Anything else is work related so goes in briefcase. Lower jacket pockets remain unused!