"Sidesaddle riding is a form of equestrianism that uses a type of saddle which allows a rider (usually female) to sit aside rather than astride an ...
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equine. Sitting aside dates back to antiquity and developed in European countries in the Middle Ages as a way for women in skirts to ride a horse in a modest fashion while also wearing fine clothing. It has retained a specialty niche even in the modern world." - (en.wikipedia.org 16.10.2019)