Jalie 3239, new for 2013. Looks like the fitted legs might work with the bodice from the zip-front skating skirt (2800), rather than having to severely mod the bottoms from 2916. The leg pattern is in two pieces already, which would make it easier to include the odd-ball seams at the knees, as seen in the high-res images of BW.
Catsuit BodySuit Unitard Sewing Pattern Women XS, S, M, L Kwik Sew 2108
Copyright 1991 New old stock in unopened original package Misses cat suits, without side seams, have long set-in sleeves. View A has center front