If you have one of the larger rulers (like 24") you might fing that there is a 90 degree marking on it that you could use for the one requiring it. I'll see if I can find any other pattern ideas. Here is a link with a bunch of tree skirt patterns (free)
http://www.allfreesewing.com/Tree-Skirts Good luck
Last edited by countrydancermom; 11-08-2011 at 10:06 AM.