Summer business casual sits in an awkward corner of the menswear universe. Dress too formally and you'll spend your commute feeling like a roast chicken. Dress too casually and you'll look as though you've mistaken the office for a beach bar in Mykonos. The challenge, as ever, is balance. Looking professional in warm weather isn't about stubbornly sticking to the same wardrobe you wear in February. Nor does it mean turning up in swim shorts and hoping nobody notices.