The charles owens posted above are the best!! However you mentioned top hats. In case you are not aware, top hats and hunt caps are no longer allowed in dressage or the dressage phase of eventing except for in the ring (ASTM helmet is required for riding outside of the ring I.e. Warmup) of FEI and Prix St. George events. So I would not look into a top hat or hunt cap unless you are competing at this level!