The Blanket Stitch is a stitch used to reinforce the edge of thick materials. It is also called a whip stitch. It is defined as "A decorative stitch used to finish an unhemmed blanket. The stitch can be seen on both sides of the blanket." This stitch has become popular for use with polar fleece produced by Malden Mills and Berkshire Blankets of Ware Massachusetts. This stitch has long been both an application by hand and as a machine sewn stitch.
As a mechanical stitch it is often defined as a whip stitch or a Merrow Machine Company Crochet Stitch.
In the early 1990s Chinese manufacturers copied the design of the original crochet sewing machines.
In 2007 Merrow renewed the patent for the whip stitch and is currently involved in litigation with several Chinese firms who are accused of violating Merrow's intellectual property rights.
There are many styles of production blanket stitching. Some rolled, narrow, with elastic, and traditional.
The blanket stitch is commonly used as a decorative stitch on an array of garments; beyond blankets to sweaters, outerwear, swimsuits, home furnishings, and much more. The blanket stitch is a name which has come to describe the application of the stitch rather than its actual use.