The short sleeve shirt is something a lot of British men treat as exclusively holiday wear which means they own bad ones bought in airports and then wonder why it’s hard to wear one convincingly at home in summer. A well made short sleeve shirt in good fabric is actually a strong option for the warmer months that works across a range of casual and smart casual situations without the formality of a long sleeve. The bowling shirt and camp collar styles have both become reliably strong options that work particularly well with simple trousers and clean footwear. Linen or a linen cotton blend is the fabric that works best in warm weather because it breathes and handles the heat in a way that cotton alone doesn’t quite match. Keep the fit slightly relaxed rather than fitted because the short sleeve works better with a bit of ease and a fitted short sleeve can look awkward rather than sharp.