I also find it easier to do it from a rectangle. The general method I use of determining how long a rectangle to cut is your waist x 3. Works pretty well for me. I find gathering a rectangle is easier than gathering a circle. And...I'm lazy. I don't want to go to more effort than I must if I can do it the easy way and it'll look just as good.
Costume Con - Kili in a dress
Atomic Lollipop - Come visit me at the Make-Your-Own-Button free craft booth!
Polar Chill - check out my costume DIY panel and workshop
FanExpo - Iron Man Mark VII version 2, Pacific Rim Jaeger pilot?
FanExpo - fem!Iron Man Mark VII - The Iron Man Armor Project
Atomic Lollipop - Vanellope von Schweetz; raver!Sailor Mars