FWIW, if I am a passenger I wear a short sleeved shirt with a breast pocket, and a fleece. (And black jeans).
I can modulate my personal temperature on the aircraft by wearing or removing the fleece. I put my passport and boarding card and phone in my shirt breast pocket. My wallet, (with credit cards, driving licence and paper money) is in my jean's back pocket. My keys, (one front door key, one car key with remote fob, one bike lock key), are in my jeans front pocket. I normally wear a wrist-watch.
If I had to get up and leave in a hurry, I could do so with just these items on my person, and not need to take my cabin bag. If I needed to take a taxi and book into a hotel, and buy more clothes etc, I could do so with my credit card.
The fleece would keep me warm outside if required and I look fairly smart and presentable in that and the black jeans
