If you are on a tight budget, this Hugo Blouse will fit the bill. It's a fail-safe choice, while not very costly. Another great option is this Tara Jarmon Coat. While the price is not too high, be sure that this piece will become a worthy addition to your wardrobe. You might also want to consider this Rag & Bone Shift Dress. 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 what you're looking for is this Burberry Trench Coat. It's more expensive but worth your money. While you're at it, also have a look at this Jenny Packham Evening Dress. Yes, this item is expensive, but it does not mean it's not worth it. And one more item you might be interested in is this Elie Saab Gown. 'Cause you deserve nothing but all the finer things!