Machine stitch exactly on seam line with a regular machine stitch.
Tear off freezer paper leaving machine stitches in place. Clip through machine stitches every three to five stitches on the wrong side of fabric. If you need to leave in some stitches to mark where something will be tucked under some other piece, clip this piece on right side too, only where the piece will be tucked under. Baste under seam allowance from right side of fabric turning on line of machine stitching - Clip fabric if necessary. If something will be tucked under some other piece do not baste this part under.