The Denim Dare

I happen to have a denim full sleeved shirt & was wondering what to pair with it. It has a collar and ruffles ( not thick) along the front. I have been wondering what to pair with it. Should I go for a a gathered skirt or slacks or do I have any other options???? In my quest I came across this excellent site by H and M where you can mix and match things. Its' fun. And meanwhile I am curious to know what your suggestions are.