Hannah from While They Sleep has the neatest tutorial on how to make a skirt from a fitted sheet. Check out this picture:
The greatest thing about this is that you don’t have to worry about making an elastic casing because you’re using the elastic fromthe sheet as the waist. WOW! Hannah – this is super cool!!! Thanks a million for sharing.
If you’d like to make a skirt pattern using your own measurements so you’ll know that the fitted sheet skirt will fit, you can find a wide variety of skirt patterns (including nice gathered skirts) at PatternsThatFitYou.com.