I love Sienna's look, and best of all the Express Shawl Collar Sweater she's completing the look with. The sweater runs for a whopping $88, which isn't designer priced but it's not exactly "cheap".
Love It? Get it here...
Shawl Collar Sweater, Express $88
Want something a little cheaper?
Old Navy's Cable Knit Cocoon Cardigan is just $34.50 (plus get 30% off with promo: onget30)