Doug talks about fire resistant cloting at
http://www.equipped.org/shelter.htm He points out that wool and silk have natural flame resistant capabilities but not as good as Nomex and PBI fabric and links to
http://www.bulwark.com/default.asp I have found this:
http://www.polartec.com/movies/THERMALM.MOVhttp://www.polartec.com/contentmgr/showdetails.php/id/220I don't know if they are easy to find (at surplus and in the auto racing industry according to Doug) or if they are affordable or if they have a nice look. But as far as fashion goes, the most important is the underwear anyway.
I guess a lambskin leather jacket is nice since it's also good for insulating.
François