If you're a frugal shopper, your best bet is this Theory Long Cardigan. It's a popular product, while not very costly. You might also want to consider this Open Cardigan. It's a product you're bound to love which also won't break the bank. You may also want to look at this Tory Burch Cardigan. This item is not expensive either, but it will make a difference in your wardrobe.
If you have enough to afford it, then you won't be disappointed if you check out this Kimono. It's an expensive but smart option. While you're at it, also have a look at this Vince Open Cardigan. Yes, this item is expensive, but it does not mean it's not worth it. And how about the luxurious MS MIN Open Cardigan? Yolo, right?