What you need:
Approx 6 meters (around 6.5 yards) jersey or cotton stretch fabric. (If you want longer straps, get around 7 meters)
matching thread
sewing machine
Cut your straps along the width of the fabric about 12 inches wide. Most fabric width is 52", but feel free to make your straps longer to get more variety with the styles. On my blue gown I made the straps closer to 72 inches long and that was good too.