I just came across this picture of Jessica Alba:
I adore everything about it. The trench and buttonup is very classic and chic. The jeans and bag give it a more casual feel, and the earrings add a little flair.
I'm going to try and re-create this outfit with pieces from my own wardrobe. In particular, I have this fabulous Alice+Olivia cordoroy trench that will work:
I can't wait to try it tonight!