i started with maing my own patterns, and it was easier than using a premade one.. it was like this:
measure widest part of hips. add 2 inches or so for gathering. that is top measurement.
how much spin do you want? add, say, 30 inches to the waist measurement. that is your hem measurement. a 90 inch spin is very full and fun to wear, but ymmv.
how long do you want the skirt? measure from waist to wherever you like. add 2 inches for waistband and 1 for hem. there's your length.
how many panels do you want? say you want 6. divide your waist and hem measurements by 6. add 1 inch for the seams. now you have the measurement for the top and bottom of each panel.
draw out your panels on wrong side of folded fabric and cut. when you have one cut you can use it as a pattern for the rest.
sew them all together, pressing seams open. fold over the top 1 inch and sew almost all the way around, leaving a gap at one of the seams. that will channel your drawstring. you can make a drawstring (preferred) or use a ribbon or some such.
Make your hem and VOILA! a very easy to sew strip skirt. Go hippie go! But made long and of, say, a dress crepe, it is a lovely and elegant skirt.