This is a Jaycotts post talking about the Blind Hem Foot
This is a great way to stitch the bottom of skirts, trousers, blouses etc the effect is almost invsible.
Once you master the technique you will find it quick and easy every time.
This is the blind hem foot.
This presser foot has a guide which is positioned against the fold of the hem to keep the stitching the same width all the way round the hem.