If you're a fan of casual pairings, then you'll love this combo of a white crew-neck t-shirt and navy jeans. You know how to smarten up this outfit: brown leather casual boots. This combination isn't a hard one to assemble and it's summer-ready, which is important when it's baking hot outside. Just because you've reached your 40s, doesn't mean you shouldn't look trendy, and this pairing proves exactly that.