Such essentials as a navy crew-neck t-shirt and khaki chinos are an easy way to introduce subtle dapperness into your casual repertoire. For a more sophisticated finish, why not introduce navy leather loafers to the mix? Now that's how you do smart casual as a 30-year-old guy.
For a never-failing casual option, you can rely on this combo of a navy crew-neck t-shirt and khaki chinos. Take your outfit a whole other path by wearing navy leather loafers. Combinations like this are what ultimately will gain you recognition and respect from your peers.