I read your horse riding mother and daughter letter with interest.
When I was a young girl, fifteen, I used to work in a racehorse stable as a so-called trainee jockey - mucker-out on low pay and a promise more like.
We were issued with old-style not-very-white rubberised mackintoshes to wear. The boss was old Public School, and to him we girls were just scum. He tried to have us in the horse stalls, the hayloft or anywhere else. Wherever - he always wanted us wearing our mackintoshes and he was always threatening to use his crop on our backsides.
In fact he was a silly old twit rather than a menace as when it came to it he couldn't really carry through! He used to give out fifty pound notes so we didn't tell his wife.
However, myself I did make traditional use of the hayloft with two boy friends (on different occasions!) who worked at the stables, in both cases wearing my stable-girl's mackintosh uniform. I still get excited when I smell the rubber of these mackintoshes and to this day I wear one.
Alas, I never became a jockey! - I ended up working as train driver instead.