"Jodhpurs in their modern form are tight-fitting trousers that reach to the ankle, where they end in a snug cuff, and are worn primarily for horse riding. The term is also used as slang for a type of short riding boot, also called a paddock boot or a jodhpur boot, because they are worn with jodhpurs. Originally, jodhpurs were snug-fitting only from just below the knee to the ankle and were flared at the hip; modern stretch fabrics have allowed jodhpurs to remove the flare and yet remain supportive and flexible."
Ref: Wikipedia
"Riding breeches are specifically designed for equestrian activities. Traditionally, they were tight in the legs, stopping about halfway down the calf, with buckles or laces in the calf section, and had a pronounced flare through the thighs that allowed freedom of movement for the rider. However, with the advent of modern stretch materials such as spandex, modern breeches have no flare and fit skin-tight. Zippers and velcro fastenings have replaced laces and buckles at the calves as well. The flared style is seen at times, and is available to cavalry and other historic reenactors."