A white and navy crew-neck t-shirt and shorts are wonderful menswear essentials that will integrate nicely within your casual fashion mix. White canvas low top sneakers are a welcome accompaniment to this look. As the weather is getting warmer, it's time to get rid of those heavy winter clothes and choose an ensemble that's lighter, like this one here. This combination shows that figuring out how to dress well as a man in his thirties is totally doable.