What is Suki's pants in "We Don't Come Natural to It"?

The pair of leather pants Suki keeps in her desk drawer in "We Don't Come Natural to It" is a symbol of the eating disorder she and the narrator share. The pants are folded inside a file folder that is labeled "THIS WAS YOU" (101). It is meant to remind Suki of how she looked when she was thinner so that she will continue to starve herself.