Bend the wire into the shape of a figure. (Depending on your child's age, you may need to help him or her with this.)

I cut up some strips of old fabric then tied a knot of fabric around the wire waist. My four-year old then took over wrapping the mummy. She wrapped the fabric around the wire in multiple angles and directions.

Create multiple layers to make your mummy thicker, or fewer layers if you want your mummy to be skinnier. 

Once my daughter finished making the mummy, she added a dab of glue to the end of the fabric and tucked the end into the "gauze." (You can also just tie the end of the fabric around the mummy.) 

She loved repositioning her mummy mannequin and moving him (her? it?) around the house!