Sophisticated, yet relaxed, I really like this "braid jacket" I found on Le Train Bleu's website (pictured right). I think it would be great for days in the office when you want to look slightly more than business casual, but don't want to wear a full suit. Pair it with slim fit pants and a pair of high (3 or 4 inch) heels - and I would wear a cami or shell underneath. The jacket is made from viscose, polyester, and spandex. It is on sale for $146.30 (don't know what it was originally).
Find it here.