Dress for the night or two of waiting for rescue after treating injuries. Consider how you'd dress if you knew you'd be pinned in your seat that long.
This. unimogbert, that's an interesting website the NTSB has on aviation accidents - thanks.
Scafool mentioned recent threads on related topics - here's one:
http://forums.equipped.org/ubbthreads.php?ubb=showflat&Number=169394&page=1Chuck Roast also markets nomex fleece.
http://www.chuckroast.com/fire-safety/nomexfleece.phpNo affiliation.
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(posting this as someone that has unintentionally done a bunch of stupid stuff in the past and will again...)