well i dont know if this would work bc i dont really sew (i buy fabric and my mom sews.) but i was thinking:
cut through the bottom of the dress up to wherever u want(i think i would suggest until right under that belt) evenly on the places u would usually fold in pleats for a school girl skirt.
then you get zippers of the appropriate length for where you cut.
you also get fabric of the same kind and different color, maybe silver because of the future thing.
sew in trapezoid or triangle shaped pieces of that silver* fabric in where u cut earlier and the bottom would end up wider.
other than making it into a pleated dress i have no idea what you could do with it.