I made this in a size 3T and it is about 13″ long which will allow for some growing room. I had 2 skeins of Spud and Chloe sweater yarn (Aran weight) and 1 skein of their fine yarn. I used the sweater weight for the skirt (size G hook) and the finer yarn for the ruffle and the contrasting single crochet casing for the waistband.
I completed three double crochet rows to create the ruffled edge along bottom. Crocheting 4 DC into each stitch for the entire first row, 3 DC into each stitch for second row, and 2 DC into each stitch for third row.
I inserted a 1″ non-roll elastic into the waistband casing so it would be easier to pull on and off. It is very bright and cheery and I think will look really cute with tights and/or leggings.