This classic and casual pairing of a navy blazer and chinos is very easy to put together without a second thought, helping you look awesome and ready for anything without spending too much time searching through your wardrobe. Finishing with light blue driving shoes is an effortless way to inject a hint of stylish casualness into your getup. You're guaranteed to always look stylish even despite the unbearable heat if you keep this look as a last-minute grab. This is a nice and mature outfit for a 20-year-old man.