British Riding Clubs have published the latest guidance and rules for Hats and Body Protectors.
NB You may have read about the change to riding hat standards concerning EN1384: the guidance indicates that there is no effective change for 2015 (EN1384 is acceptable) - however, from 1st January 2016 EN (or BSEN) 1384 is not of itself a sufficient standard (hats additionally conforming to remaining approved standards will acceptable).
Look out for this if buying a new hat!
Download Body Protector document
Download Hat Tagging document