seams. i positioned it about 6" in from the end.
the zipper is sewn in last. with the whole unit still wrong side out, i pinned the zipper tape to one of the sides of the opening and sewed it up.
when attaching a zipper, always remember that right sides must be facing (i.e., right side of zipper against right side of fabric).
i had to run a few stitches at the ends of the zipper tapes to close them up against the seam before turning the whole thing right side out.
if you were wondering how the hair elastic is supposed to work, take a look here.
loop the elastic around the end of 