I love both of Katie Holmes' outfits below for casual Fridays. If I'm wearing jeans to work, I usually opt for ones like hers that are cut like trousers. I love how she paired a flowy top or simple tank with a more dominant element on top- a tweed or embellished jacket (which could read old lady but totally doesn't here).
Here are some options to create a similar look on your own:
At the Splurge level, both of these jackets are to die for. This Tory Burch jacket has great texture, fringe detailing, and just the right amount of embellishment. The relaxed fit and frayed edges of this Rebecca Taylor jacket are the right mix of casual and formal.
A tie-neck silk blouse is perfect under these types of jackets. The print on this Elizabeth and James top is gorgeous, while this Tibi blouse is soft, elegant and goes with everything. At the Save level, the prints on both this Free People blouse and Vince Camuto blouse are subtle but still interesting.