I've made a couple of these. The directions were horrible. I also contacted the designer, who said that the instructions were supposed to be revised soon. It's been awhile, but one correction involves the neck edge. You cut the bib on the fold, and no where does it mention to cut the neck edge open on the fold. But, you must, or the bib won't fit over baby's head.
I also made a note where it says to "Pin leg straps in place". The straps must be placed INSIDE the front and lining leg pieces. That way, when the legs are sewn and turned, the straps will be OUTSIDE!
I have some revised directions. Maybe this will be clearer:
Sew leg straps right sides together, leaving straight edge open for turning. Turn and press. (You've probably already done this). Next, lay bib front and back right sides together. Insert leg straps (facing in) near bottom inside edge of both legs, having raw edges even. Pin and sew around entire bib, leaving a 3" area open for turning. Then..turn bib and topstitch all edges closing the opening used for turning. And, finally, sew velcro fasteners (about 1") at neck edge, and on both lower outside legs and on leg straps.
These instructions are different in that all velcro is sewn on when all the other sewing is finished. Hope this helps!