A blazer and slim jeans has become my go-to outfit for any purpose at all - running errands, brunch with mom, early Sunday dinner, casual Friday. It also makes getting dressed easy for those days when I have no inspiration but still want to look chic. I particularly like this blazer because it's double-breasted and provides a great silhouette when buttoned. I bought it during Lucky Shops in LA a few years ago, and it's been a great investment because it can easily be paired with skirts and dresses as well.
Hope your 2013 is off to a great start!