Using the original pattern (Crochet Wrap)...sized down in this manner...
Foundation chain with F hook
Rows 1-3 worked with D hook, switching back to the F at the final Ch1
Rows 4-60 worked with F hook, switching back to the D at the final Ch2
Rows 61-63 and side finishing worked with the D hook.
Back waistband measures 13 inches
Front waistband measures 9 inches
Rise measures 13 inches
Crotch width measures 8 inches
(all measurements unstretched)