Black Hugo Boss shadow stripe skirt suit, NEW white Splendid cotton scoop-neck t-shirt with peasant sleeves, black pumps (changing to my Amalfi's when I get to work because I left them there last night, these were just for the picture).
I like pairing a t-shirt with a suit, it makes it seem less stuffy. This t-shirt also has some details (like the neckline and the sleeves) that raise it above plain old t-shirt status. I also love a new white shirt or t-shirt. They are kind of decadent, because they don't look new for very long.
This suit would be more flattering if the skirt was A-line, but I think that a straight skirt is seen as more professional. It's not too narrow, so I think it's OK.