Originally Posted by Blackhawk

What was said above.

A good pilot sweater. The type with epaulettes and wings if that can be worn as outer wear at your airline. If not needed it can be wadded up and stuffed in your overnight bag.
Next layer of “suck” is the leather jacket. It can be worn by itself or in conjunction with the sweater. On overnights you can take off the pilot stuff and wear it out.

Problem with the trench coat is that you then need something for overnights. Extra packing. But up to you.

Don’t mess with your feet. I don’t get people who buy cheap shoes that don’t last a year and won’t keep your feet warm. For cold weather I splurged on a pair of black shearling lined boots that are TSA “safe”. As with the leather jacket, great for cold overnights.

Just don’t be the tool wearing NorthFace in uniform.