Ppruner
R16 has pointed me to a recent accident pertinent to the discussion about clothing worn, an extract,
The pilot survived the impact but suffered a number of serious injuries, particularly to his neck and burns to his face and neck. He had been wearing cotton overalls over a polyester cotton shirt.
The pilot’s burns were consistent with his flying suit being open and loose around his neck whilst wearing a non-fire retardant shirt underneath.
https://assets.publishing.service.go...MSTG_10-17.pdf