I am loving these jeans, they kind of look like dress pants so had you not mentioned anything about denim I would never have guessed! (lovelenore.com)
One long blouse which almost looks like a dress (I like to combine it with a chunky sweater when it's crisp outside) and the other one with really cute ruffles. (heartfelthunt.com)
How about a couple of dressy skirts & tops that look like a dress when worn together. (unefemme.net)