Question posed about crew-clothing:
"... seen pilots and CCMs wearing uniforms ... likely ... to go up if close to a fire ... any actual facts, stories, anecdotes where clothing has made a difference in some way? A nomex suit has saved somebody's skin in a flash fire?, a nylon CCMs uniform has burned them ..."
You should be able to document historic occurrences with mention of flammability or melting of crew-clothing. Forty years ago such videos were common during training, with victims describing various protective items or extremely hazardous clothing. Most of us sat through these training sessions several times, and this was a regular topic (don't ware synthetic materials next to skin, use cotton or wool). Various mishap F/A's described "nylons" melting to their skin.
During most flight testing on B767 most participants arrived in regular clothing, but on the day of the big RTO down at Edwards, the FAA pilot and his FT Engineers showed-up in Nomex Flight Suits. [TBC had elected to NOT install any excape chutes for fear of COST-of-deployment during evac, so we used a long ladder to evac' after one brake-lockup.]