I have no idea what breeches are. So I referred to an online dictionary and learned that they are trousers extending to the knee or just below, worn for riding, mountaineering, etc. The most common are riding breeches. Riding breeches are purposely 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, modern breeches have no flare and fit skin-tight. These laces and buckles at the calves were replaced with zippers and velcro fastenings as well. Thanks to the internet because I can easily search for any word that I am not familiar with. That’s the power of the internet.

Source: Wiki