This is how you do smart-casual without looking like you tried too hard. Cut from a washed cotton twill that already feels broken-in, this three-button jacket ditches the stiff, padded shoulders of traditional suiting for a much easier, relaxed silhouette. It is half-lined with cool chambray cotton, keeping things light and breathable when the temperature climbs. The details keep it firmly in everyday territory. You get three functional patch pockets on the front for a workwear-inspired edge, plus working button cuffs that you can actually roll up. It is a brilliant option for summer weddings, race days, or just looking sharp at the office. Pair it with the matching Mareham trousers for a relaxed suit, or throw it over a dark knit polo and some loafers to keep things casual.