Equestrian is a horse-riding aesthetic of jodhpurs, boots, blazers, and English countryside elegance, rooted in aristocratic riding culture and reading as refined athleticism. Riding boots or tall leather knee-highs are the defining piece. Jodhpurs or slim trousers go into them. Cable-knit sweaters cover the top. Quilted gilets and Barbour-style wax jackets layer over that.