After an extensive failed internet search for an irregular design rainbow fabric, I decided to make my own. I ordered 10, 1/2 yard cuts of bright colors of interlock knit fabric from Nature's Fabrics.
I made a few changes to original design. I cut my usual size medium, but I could have sized the bodice down to a small. The pattern is designed for woven fabrics and with the switch to a knit, I had to remove excess fabric from the side seams.
I omitted the gathers at the neckline in favor of a block design. The tight bunching was in conflict with the lines of the skirt.