I have an Irvin, its brilliant especially the large upturned collar that stops the wind reversal from the windscreen striking the back of the head. Buying the garment from the old nissan huts at Thruxton is equally as good. They made adjustments for my wife's jacket and sent it on in the post.
i have a question though. How does it perform in the rain? does it need some sort of proofer to stop leather discolouration? Its a bit too big to have an overlayer as well.