Oscar and Turbs have raised some good points (never thought I'd see those two linked!). The full nomex kit isn't really a viable option for the reasons Turbs mentioned earlier but an Oscar style hybrid kit such as non synthetic shoes, socks trousers and underwear with maybe a nomex flying jacket or a leather jacket and a pair of nomex gloves could be a sensible compromise.
I have a pair of ex USAF nomex overalls and a nomex jacket bought from the States for about Aud$200 all up. I'll wear those as I see fit. If I'm doing circuits around Canberrawhere the response time for the firemen is pretty damn good, I probably wouldn't kit up 'cause I can probably get down and out before I start to need basting, but on a flight further afield I'd probably go with the kit.
Jake, I don't think anyone here is suggesting PPE should be mandated. It should of course be a matter of personal choice, but the wearing of it it is surely a topic worthy of consideration discussion here?
To answer your question directed at the cotton wool brigade, yes I will be providing appropriate PPE for my wife when she flies with me and I will be recommending appropriate clothing to anyone who chooses to fly with me. What she, and they, CHOOSE to wear will be up to them. And yes they do matter.
My Co-owner and I have discussed these options and I believe he is coming to see the value of PPE but what he chooses to wear will be up to him. He can fly bare-assed & buck neckkid if he wants to - so long as I'm not there to witness it!