When I fly I make a point of wearing comfortable but sturdy clothing. Long sleeve shirts and long pants in a fire resistant fiber like cotton or wool. Sturdy leather footwear(usually boots). A light jacket with a fold-away hood, leather gloves, ear plugs, and a wool watch cap in stuffed the pocket. Ear plugs can make sleeping on the plane, or terminal, much more comfortable. The watch cap pulled over the eyes helps also.

Even if nothing major happens clothes you can walk/jog a good distance and lounge in comfortably makes a difference. Airports, and many airliners are kept far to cold for my tastes so the jacket is handy. It isn't uncommon to have the smaller planes diverted to out of the way airports where you may have to walk a good part of a mile, sometimes in miserable weather and through standing water, to get to the terminal.

The ladies in skirts, high heels with open toes can have a time of it. And that is just getting to and from the plane. I hate to think what a deficit they would be dealing with in the event of a landing that overshot into a swamp or icy water.

I would avoid rayon because it catches fire readily. Many other man made fibers melt. If they melt onto skin they can make burns far worse. Synthetic underwear, unless it is Nomex or similar, can put the boys at risk.

A lot depends on where your flying. The places I'm likely to fly are all pretty settled so any crash or accident will most likely be seeing rescuers in a short time. Flying into the arctic tundra or the Amazon rain forest I would be more concerned with long-term survival.