Turn the skirt right-side out again, so you don't see the zipper teeth.

Rotate the fabric so the zipper foot is perpendicular to the zipper tape.

Position the zipper foot on top of the fabric 1/8th of an inch from where the zipper tape meets the garment.

Sew back and forth at least 6 times to seal the end.

Flip garment over to see the stitch line you just made. Cut off excess zipper tape.