I don't like this one, it's kinda ugly, but I like the idea. DIY Sweater (mini) skirt - can be as short or as long as you want, depending on the size of the sweater you use to start. Definitely want it snug though I think, so take in the sides if need be.
Designs by Sessa, old sweater repurposed into cute mini skirt! Now, remember, use the sleeves you cut off of this sweater project for the 'boot socks' you want to have peeking out of your cute ensemble!