They really dont care too much, a full face helmet is good.
If you don't plan on racing much then borrow someone's motorcycle helmet.
OR follows jerry's advice if you plan on using a lot.
They don't even require arm restaints at Byron for our cars.
Some tracks do i.e.; Great Lakes Dragway
However a long sleeve shirt or jacket, and closed shoes, are required.
See picture above

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The older I get, the faster I was........
So now I'm so fast apparently I appear to be standing still.