Clothesline's Mary Q pattern is fully lined, so if you make the lining in a fabric you like, your dress is reversible. Two dresses in one - beat that for versatility!
Surprisingly, fully lining a dress is not as difficult as you would think. Time is saved as you don't need to finish any seams with overlocking / zigzag because all seams are enclosed inside the dress and can't be seen.
Sewing is straightforward - knowing which seams to join together is the tricky part of lining a garment. To make it idiot-proof, I've included some short videos online, as it's easier to show this in 3 dimensions, rather than through photos or diagrams.
One little tip - choose fabrics that are opaque, or you will see the inner fabric showing through.
So next time you spill food/drink on yourself, just whip into a bathroom and turn your dress inside out!