When I am in that mood I just turn to the blazer-scarf combo. It never fails me. Also I am completely loving these destroyed jeans from Forever 21... they are super stretchy and I love the "I don't care, but I do" look that they exude. They bring the blazer down a notch, I love it.
Blazer, Gap (similar)
Scarf, Anthropologie
Sweater, JCrew (similar)
Jeans, F21 (similar)
Flats, Nine West (similar)