adjustable elastic waistbands, but with snaps!
Uniform-code hair accessories...
Backpack! From Little Things to Sew, yarn-dyed upholstery-weight from IKEA, reinforced twice on the bottom. The lining (magenta bandanna print -- oddly enough, Japanese) snaps in (pink butterfly snaps around on the outside, black hearts and purple on the inside), but big black snaps act as feet together with the interfacing to make it capable of standing up.) or out for easy wash/dry.
Only things needed: lunchbags, and the will to survive one more week.