I'm all about the tunics this time of year. Let me introduce you to one of my favorites:
the 'Lucy' from Junky Trunk Boutique.
This bad boy is currently available in 8 colors. I actually have 8 of them myself, however different colors have been offered over the years. But really, they are just that good. It comes in two sizing options: S/M (which I wear) or M/L. (I'm ususally a size 2 dress, or small for reference). I believe the biggest difference between the two sizes is in the arms, as they are fitted there. For just $25, you won't want to miss out on this one.
With fitted sleeves and a loose bodice, it is flattering on absolutely everyone. Wear them with leggings, tights, knotted up with some skinnies, or wear it on its own! I'm 5'7 and (with a layering tank under to be safe) it totally works as a dress. It is just so versatile when it comes to styling