We can’t stop staring at Alicia Vikander’s chic ensemble at the Louis Vuitton show at Paris fashion week. Her fitted tweed blazer is perfectly topped off with a black belt that has us stocking our carts with this fall accessory must-have. A black belt is essential for cinching the waist and showing off your shape, no matter if you’re wearing denim, a dress, or styling it with a plaid jacket like Alicia. Shop our affordable under-$100 black belt picks below.