Haron Preston women’s pants large breeches equestrian looking lightweight pants

Heron Preston women’s pants large breeches equestrian looking lightweight pants there is a L tag in them but they seem pretty small. Vintage? Good used condition although there are several stitching anomalies shown waist 14” inseam 29” they look like breeches but I didn’t find anything like these in my research, unique? Rare?