I Agree on Protective Clothing!
I've been wearing the same suit as Mr. Tuttle is so fashionably demonstrating for many years as a volunteer firefighter...probably overkill for flying, but it sure makes you feel good when a burning roof collapses on you!
For flying when I have any doubt about the airplane (i.e. Testing flying - by definition), I wear Nomex flight suit, gloves, cotton socks, and fire retardant shoes. Boots are a next best choice, but they make my flying clunky.
If I am wearing a parachute, I wear a helmet, reasoning that if I am bailing out, I may be flailing about and bump my head, or the airplane is probably flailing about, and may bump my head. I wear an HGU-55 - I just consider it for bumps, not to protect me in a collision with a fixed object.
Now, my little story. We lost a wonderful person from our organization a few years ago. She was an M.D. and superb aerobatic pilot, CFI....she was giving a person a checkout in his newly purchased homebuilt, something went wrong, and they ran off the end of the runway trying a touch and go. Hit a tree, survived the collision, but the aircraft caught fire. She was wearing polyester that day. Burned over 90% of her body, she lived three days in the hospital. Most likely, with her Nomex on, she would still be with us. We have an annual aviation safety symposium in her memory.
The likelihood of a fire? In normal operations, with a tested airplane - very remote. With a new plane, new plumbing? Not quite so remote in my opinion. The consequences if you guess wrong? Can be pretty bad!
I'm not saying you must do one thing or the other, just giving a couple things to think about.
Paul