Chicken-and-egg situation

I’m in a quandary at the moment. Due to the alteration of the darts, the length of the body has changed and it feels like it is about 1cm too short now. What would you do? Sew the skirt on as it is now or would you lengthen the body and hide the lengthening under a belt?

from Instagram: https://www.instagram.com/p/CNFeBt6hkSR/