To style a men's long sleeve knitted polo shirt, pair it with tailored chinos or smart trousers for a polished look. Opt for neutral colours like navy, grey, or beige to keep it versatile. Layer it under a blazer for added sophistication or wear it solo for a relaxed yet refined vibe. Complement the outfit with loafers or brogues and a leather belt. For a more casual approach, team it with dark jeans and clean trainers. Accessorise minimally, perhaps with a classic watch, to maintain its sleek appearance.