If you don’t want to splurge, this Topshop Duster will fit the bill. It's a foolproof choice, while not very costly. Why not also check out this Topshop Coat. It's a product you're bound to love which also doesn't cost the earth.
If you're looking for an item in the middle of the price range, consider buying this Topshop Duster. While the price is very reasonable, this product is an easy wardrobe update. In this price range, you can also check out this Topshop Coat. It's an attractive option both price and quality-wise.