Make a sewing pattern by covering an object with a plastic bag and wrapping in packing tape.
I made a sewing pattern for a bike helmet cover, but this technique can be used to make a pattern for just about any object, even people!
Step 1: Cover and wrap the object
Cover the object with a thin plastic bag. A dry-cleaning bag is a good weight for this. Now wrap the object in packing tape. I cut lengths of around a foot (30cm) to make it easier, but the important thing is that you want to wrap the object tightly! Your packing tape will get lots of wrinkles - that's fine. Baggy bits? Just go over them again with more tape. Make sure the entire object is completely covered.