Summer Business Casual Mens 2025. So, the challenge is to maintain a professional appearance without sacrificing. What are the essentials for a business casual wardrobe that can beat the heat but still look polished?

Here, saint laurent is putting its stamp on the rule book for how the formal men’s wardrobe should look — in all of its classic, quirky and modish iterations. Numéro takes a look back at the key trends spotted at the men’s spring/summer 2025 fashion week in milan and paris.