Try teaming a tan plaid waistcoat with a navy long sleeve shirt if you're going for a proper, fashionable outfit.
Navy Long Sleeve Shirt with Tan Plaid Waistcoat Outfits
Hard proof that a tan plaid waistcoat and a navy long sleeve shirt are awesome when worn together in a classy outfit for a modern man. And if you wish to immediately step up your outfit with footwear, why not complement this outfit with a pair of brown leather oxford shoes?