If you're not planning on spending much, this Sanctuary Vest will fit the bill. It's a fail-safe choice, while not very pricey. Why not also check out this Sam Edelman Jacket. It's a product you'll fall in love with which also doesn't cost the earth.
If you're looking for a happy medium, take a look at this Lucky Brand Blazer. While the price is very reasonable, this item is an easy wardrobe update.