How to make a skirt in 30 seconds! As seen on Cutecircuit.com:
1. Get a large shirt you think will make a good skirt and that you are willing to sacrifice to the gods of fashion. Suggestion: Steal your boyfriend’s death-metal shirt! You’ll be doing him a favour.
2. With a fine pair of scissors or a seam ripper, cut the collar in 2 places where the shoulders are and open the top shoulder seam a little. This opening is the waist, so don’t open it too much at first. Try it on and see how much you need to open it.
3. Turn the sleeves inside to make pockets! If you want to get really fancy and make pockets that you can actually put something in you can turn the whole skirt inside-out so that you can stitch across the sleeve opening to close the pocket.
4. Finally, if you want extra refinement you can add a snap or tie-string at the waist to keep that skirt clinging to the hips. And voilá: A new skirt with a fancy 40s style tulip shape!
More details here