Hello maxi skirt!! (Aka Skrousers....!)
Seriously lovelies, this was so easy I didn't even remember to take photographs to show you how...but I'll explain. (p.s. I know how lame that is...what's the point in me even blogging this....but Ben keeps nagging me for not blogging so you know, I have to get something out there!)
From the crotch down unpick both inside leg seams on your trousers. Don't unpick the crotch. Lay the Skrousers down flat inside out and pull together both front seams, pin and stitch. Lay the back seams together and stitch down from where the funny crotch bit goes funny down to about 8" above the hem. Fold the remainder under and stitch to form a back split.
Job done, flounce around in your Skrousers and pretend you're a celebrity and make up crazy words like skrousers :) You can use that yourself though, I'm not precious :)