I would either contact IB themselves, or perhaps ask Maz if she has enough time to replace the elastic for you.

ah dang lady you know me to well

their pretty easy to fix....cut a small slit in were the elastic starts in the little 'channel' top and bottom (start and finish or front and back of leg)

get some 6mm swimming elastic from Spotlight and a small safety pin.

Hook saftey pin on the elastic end. thread the saftery pin (with elastic) through the small slit until you reach the top slit.

Pull out the saftey pin, and with the sewing machine do a few zigzag stitches to fasten the elastic in place slightly, then pull the elastic as far as you can through the bottom slit and sew until you reach that slit.

Gosh does that make any sense at all????

If it doesnt.....send them my way (as long as its not 10) and I'll fix them for you