Here in the States not many people wear them unless riding cross country. I don't foxhunt so I don't know abou those folks. Most dressage riders don't even wear a helmet. They are only compulsory on x-c.
I am writing a book, a Pride & Prejudice sequel, but throwing a bunch of horse stuff in.
Here are some descriptions of some points:
Darcy will be a racehorse breeder. Since he is supposed to be one of the richest men in England. I'd like to encorporate trips to racetracks of the time...