A gilet and a denim shirt are must-have menswear essentials if you're figuring out an off-duty closet that matches up to the highest fashion standards. To introduce a more casual spin to your outfit, introduce white canvas low top sneakers to the mix. So as you can see here, it's a knockout, not to mention season-appropriate, outfit to have in your transeasonal rotation. If you're often not sure how to dress as a teenage guy, this pairing is a practical example.