I'm just a low hours PPL(H) but I agree wholeheartedly with Whirls. It's a case of horses for courses. The boys (& girls) who do the most risky stuff and live in the avoid curve
need to wear nomex, gloves, helmet etc but for most of us we are far more likely to be 'broken' in a car crash than driving helo's.
FWIW avoid man made fabrics (have you even melted a nylon boiler suit onto yourself
) and just wear comfortable clothes.
I agree with kiwi chick though that after an hour of hovering practice in the early stages you'll be drenched in sweat - even in "frozen" Newcastle.
Whatever you wear - go fly and never look back, There's nothing like it!
Ian.