For this costume you will be making five tutus. One for the waist, one for each wrist, and one for each ankle. Measure the wearer's wrist, ankle, and waist to get the measurements for the elastic, using the 1" elastic for the waist and 1/2" for the wrists and ankles.
Subtract an inch from the waist measurement and then cut the elastic to that length. For the wrists and ankles, subtract 1/2" from each measurement and cut. Repeat that same process for the ankles. Sew the ends of the ankle and wrist cuffs with a sewing machine or needle and thread.