In the papers Mary Kate's outfit was described as being "Grown up" and yes, I suppose it is grown up but amazingly she is a grown up!!
Her look is very simple but has a lot of impact. The red lips and big hair draw attention to Mary Kate and then you notice the beautifully simple black dress that Mary Kate has accessorized with a belt round the waste and a clutch.
I think what the papers were getting at is that she has grown up, she is no longer a little girl or a teenager anymore and her style is changing. Basically, she is finding out who she is and is trying different style like everyone does.
Anyways, back to the outfit! Personally it is a winner - it is simple and elegant. Plus her red lips rock! x