I'm currently working on a Bon Clay cosplay from One Piece. But his pants essentially are a ball and I'm not sure how to go about making them. I was thinking of using craft foam but even then I'm still not sure what to do. Any suggestions would be GREATLY appreciated!!!
I have no idea where you'd find a commercial pattern, but I have an idea about how you could make your own!
Buy yourself a big beach ball, and slice about 1/3 of one of its seams open (to give yourself a fake 'waist band'. Cut a hole (slightly off-center) on the left side of the uncut bottom hemisphere, and another on the right side for your other leg. Once you figure out how much space you need for your legs, you'll basically have a ball-like shell that you cut into pieces for your pattern.
You'll definitely need to look into some supporting undergarments to keep the ball shape, but unfortunately I don't have any particular ideas about how to tackle that bit at the moment.
Judal (Magi: Labyrinth of Magic): 59% (Styling Wig) Otakon 2016
Actually. The only suggestion I could give you is you might need to make a crinoline to help give you that shape, covered in layers of batting so that you don't get the lines of the wires coming through.
Actually, if your fabric is stiff enough, the fact that it comes in and meets the legs will be sufficient to keep it puffy.
I would probably develop the ball shape, but complete it by sewing the leg openings and waist band to a pair of dance trunks. that will make it more comfortable to wear.
Last, the human body is not symmetrical front & back, the leg openings will need to be skewed to the front to allow you to sit down & walk comfortably. It will feel like less puff in back when it appears the same amount of puff front & back. (unless you have no butt at all)