The blanket stitch, as you would guess, it is typically used to edge blankets, and other edges like on table cloths, runners, even wool jackets. It is considered one of the basic embroidery stitches and is the best known looped embroidery stitch, also referred to as the Spaced Buttonhole Stitch, as it is very similar to a Buttonhole Stitch. Not only is it used for making nice edges and borders, it is also used for outlining and filling shapes.
The blanket stitch is part of the looped stitch family, which are stitches where the thread is looped around the needle. In the nineteenth century, the buttonhole stitch was popular to stitch on the edge of tablecloths, napkins, sheets, pillow cases and more. Generally, when stitched as an edge stitch, frames or hoops are not used.
Here is another sample of the blanket stitch, showing both how it is used for applique and as a straight line.
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