For us it depends what track we are running most consider us motorcycles so all we need is Jackets, Gloves, long pants, closed shoes and a DOT full face helmet. For the tracks that treat us as cars - they require a race helmet and arm restraints.
Can't wait until we have an organized body of rules so we can do some racing
Working on it
The other thing that needs to be worked through is how to create a level playing field as so many owners have modified their Slingshots to some extent.