Begin with jeans that already work
A double-breasted blazer looks more considered over jeans when their waist and hems already fit well. For a relaxed office, a wash without extra detailing lets the jacket take the lead. Straight or slightly wider jeans are as possible as a narrower cut. First look at the jacket length over the waistband. When it finishes well below the hip, showing some of the top can divide the central area. A long jacket does not automatically require very tight trousers to make a successful combination.
Judge it both open and fastened
Two rows of buttons already create a noticeable front. A light top can break up a dark blazer, while a dark base keeps the area connected. A pale blazer can instead sit against a muted darker top. Fasten the jacket during your try-on even if you usually wear it open. The front panels should overlap without strong pulling. If the lapels stand away from your body, changing which lower button is fastened is unlikely to solve everything. Compare another size or cut rather than repeatedly adjusting an unsuitable fit.
Change the level of formality deliberately
Simple flat shoes and a structured bag give the combination a different feel from sporty sneakers and a soft tote. Choose according to your actual workplace. For an appointment, replace the jeans with plain trousers while keeping the blazer and top. This is often simpler than changing jewellery, shoes and bag at the same time. Finally, check the sleeve length at a desk. If you turn the cuffs back, both sides should stay comfortably in place without needing to be rearranged after every movement.
