As flannel is not liable to fray, the raw edges of the garment and the patch may be held down with herring-bone stitches and still be sufficiently strong.
The hole should be cut clear of frayed material (it is usually square or oblong). The patch should be cut from 3/8 to 1/2 an inch larger than the hole, be placed directly over it without turning in any of the raw edges and be basted into place. Care must be taken in matching the right side of the flannel, the warp, woof and ply. The patch should be held in place on both right and wrong sides by a fine herring-bone stitch (see directions) over the raw edges of the material. The stitch is usually strong enough if it goes through the material on one side only, and on the other side if it goes into but one thickness of flannel. For turning the square corners, see Fig. 42. The repairing thread is usually cotton or silk.
Stockinet and woven underwear may also be patched by using the herring-bone stitch.
It is well for a class to practice on the repair of knitted underwear using the herring-bone stitch over the raw edges.