If you're after a thrifty option, this Vest will fit the bill. It's a great choice, while not very costly. Also check out this Topshop Waistcoat. It's an item you're bound to love which also doesn't cost too much. You might also want to consider this Nine West Sleeveless Blazer. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're not the one to skimp on clothes, then you won't be disappointed if you check out this ADAM by Adam Lippes Waistcoat. It's an expensive but smart option. Another product we're drooling over is this Thakoon Vest. It's pricey but you get what you pay for.