If you're looking for an affordable item, this St. John Jumpsuit will fit the bill. It's a foolproof choice, while not very expensive. In this price range, you can also look at this St. John Pencil Skirt. It's an item you'll fall in love with which also doesn't cost too much.
If you're in a Treat Yo' Self mood, then you absolutely must check out this St. John Jumpsuit. This product seems expensive, but it's top quality. While you're at it, also have a look at these St. John Jeans. Yes, this item is expensive, but it does not mean it's not worth it.