This dress is a dress paired with a tulle dress I have made before. If the previous tulle dress made for babies aged 6 months, then I made this tutu dress for her older sister that aged about 2 years old.
As for the bottom tutu skirt, I use thin tulle fabric with a length of 6 meters, and width adjusted to the length of the skirt.
This sewing process is similar to the making of tulle dress. Gather the shoulders and under the arms parts between the front and back bodice. Wrinkle the top of the tulle skirt in accordance of waist circumference on the bodice pattern. Gather the bodice with the skirt. Attach zippers at the last time and seam the armpit, the bottom of skirt and neck.