I dont ride on roads but I bought a hi-vis silk and riding T-shirt last summer as recommended by
@carthorse.
I wear the high viz hat silk every time I ride.
I feel a right Charlie as the Police and wardens can see me miles off just as I can see their striped high-viz patrol cars. But I am probably the only rider with that hi viz silk and it is somehow a comfort to know that it identifies me. None of our yard horses have any high viz. That is out of my control but it may be a status thing.
Riding school staff all wear high viz and not wearing it shows riders from our yard are not RS riders.