In addition to walking-foot, you might want to be aware of compound walking-foot -- has both drop-feed (bottom-feed) and needle-feed (top-feed), with an alternating presser-foot (walking-foot). The following links should be helpful, and do click on "show more" on the YouTube video. With needle-feed, the needle follows an elliptical path and pulls the material through the machine along with movement of the fabric by the serrated teeth of the (bottom) feet dogs that is typical of home sewing machines. Needle-feed and walking-foot both minimize the slippage of top layers of the fabric relative to lower layers. Many walking-foot machines lack needle-feed.
Sewing machine - Wikipedia, the free encyclopedia
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