If you're on a thrifty budget, this Asos Open Cardigan will fit the bill. It's a foolproof choice, while not very pricey. You might also want to check out this Open Cardigan. It's a product you'll fall in love with which also doesn't cost a fortune. You may also want to look at this Brave Soul Open Cardigan. This item is not expensive either, but it will make a difference in your wardrobe.
If you're looking for something in between pricewise, you're in luck with this Jack Wills Open Cardigan in stock and waiting for you. You most certainly will love this piece.