Dresses women for riding and equestrian activities, in a British/north european style - no cowgirls here. Also, for clarity, we're not talking high-falutin' dressage or show-jumping. These are the girls you see at the stables, or your local riding school.
Trigger is "riding_girls".
Also recognises some equestrian clothing tags:
"Riding boots"
"Jodhpurs"
"Gilet"