To make a DIY cage, first request 1 yard and 4 inches of veil material at the fabric store. This material will be stapled around a 1 foot diameter cardboard disks. The mathematical formula for the circumference around a circle is π x D or 3.14 times 1 foot in this case. So, the distance around the disks is 3.14 feet or about a yard. Add an extra 4 inches for overlap to the yard and the total length of material that needs to be requested is 3.4 feet.