Belstaff's Circuit gilet is all about maximising style and substance. In terms of the former, the brand equips this piece with details inspired by classic motorcycle racing apparel - note the buckle-fastened neckline and sleek quilted silhouette. When it comes to substance and functionality, Belstaff deploys water-repellent fabric and a lightweight, compressible down-feather filling to ensure protection from the elements. How to wear Harrods: Style with a sweater, slim jeans and lace-up boots.