This off-duty pairing of a navy and green plaid long sleeve shirt and a charcoal crew-neck t-shirt takes on different forms depending on the way it's styled. And if you wish to effortlessly bump up this look with one piece, why not add brown suede chelsea boots to the mix? As you're going from your 20s to your 30s, you want to start dressing maturely. If that's the case, looks like this are a fail-safe option.