If you're a thrifty shopper, this J.Crew Padded Vest will fit the bill. It's a foolproof choice, while not very costly. Another smart option is this J.Crew Tank. It's an item you'll fall in love with which also doesn't cost the earth.
For something in the middle of the price range, we recommend opting for this J.Crew Blouse. While the price is very reasonable, this piece is an easy wardrobe update.