I started wearing an helmet when I took up helicopter flying. There's absolutly nothing between you and the outside world that will help in case of an accident with a chopper. In most trainers, you have a good roll bar that might protect your head.
My helmet is a HGU-55, and I just love the visors I have on it. No more dry eyes!! I have the hook ups for the O2, but since my airplane will very painfully climb above 7 500', I don't bother with buying a mask. Maybe one day if I get to fly a really performing aircraft like a T-28.
I use my helmet for three reasons :
1- crashes in helicopters (not that I plan on having any)
2- visors
3- noise reduction/comms. Like Steve said, it stays in place whatever you are doing, and this includes being halfway outside a Bell 206 looking down at your sling load.
I also always wear either my flight suit (and my newly received pair of boots) or natural fiber pants and socks. No more flying in mermudas or shorts. I have a chute, but I didn't bother in having it packed this year since I only flew once with it! And with the kind of flights that I make, I don't really need one. If the fire catches up, I'll probably be quicker to be on the ground by making the airplane reach it than jumping out of it.
And you have to think about it a bit. Would I wear the chute and the whole chebang in the Focke-Wulf when I'm taking my Mom and my sister to a breakfast? I think not...
For me it's a matter of not having the need for all the stuff, but I have it for when I'll need it.
