I lucked out that my jumpsuit fit perfectly, but Hayden's was way too long. Rather than hemming it in the traditional fashion, I opted to transform the flared bottoms into elastic cuffs, utilizing the original hem.
Once you have your opening, begin feeding your elastic through the hem (it helps to attach a safety pin to the end of your elastic as a guide). I selected a 1/4-inch elastic, which fit perfectly in the original hem.
Decide how big around you want the ankle cuff to be. Measure for accuracy before you cut the elastic. I opted to make Hayden's ankle cuffs about 8-inches in circumference.
Cut your elastic and sew the ends together. Then, tuck the exposed elastic back in the hem and sew the opening shut.
This is how it looks when one leg is done as an elastic cuff, compared to the original flare bottom.
Follow the same steps to make the other elastic cuff and you're finished. Now this can be worn at various leg lengths. Rather than having them hemmed for an exact height (kids grow fast, especially their legs), the elastic cuffs make the bottom of this jumpsuit adjustable.
On another note, it's Star Wars Day. May the 4th be with you! Check out our blast-from-the-past Rawdorable Unbaked Star Wars Cupcakes. My kids have definitely grown since then.