I made a couple several years ago and still love and wear them. They are so comfortable in the hot weather here. I did have a pattern but since I'm at work now, I can't see who made it. I think that it did help to have the pattern because it made each section successively larger and that way the top section was smaller with less gathering and bulk around your waist (like we need that. lol)
I'll look it up when I get home and see what it was called.