Small planes, what to wear for safety?

I have the the sense that there are a lot of small mishaps
and serious accidents. Does anyone have some info that
would help guide discussion. Causes: weather, pilot error,
mechanical failure.

What types of injuries a common? Trauma, drowning, hypothermia,
burns.

Do any pilots wear Nomex? Or any protective gear?

Would a chest protector or helmet do any good?