Wool clothing is an expensive investment. Taking care of it properly will help you protect that investment and save you the time it would take to shop for replacement garments in the event they shrink or tear. If you see a small rip or tear in a wool garment, repair it right away. Taking 10 minutes to fix the problem now will keep the tear from getting bigger and will also keep you from taking it to a seamstress or dry cleaner to fix the problem, or in the worst case, getting rid of it.
Put the piece of floral foam under the tear in the wool clothing.
Align the two sides of the tear next to each other. If the tear has started to unravel, overlap the two sides.
Pin one of the felting needles into the fabric and secure it into the piece of foam. You can use more pins if the tear is long. Secure the wool and the pins into the foam.
Push one side of the torn seam into the other side with the other felting needle. Press the tip into the wool, without putting the needle into the foam.
Blend the fibres together by pressing the wool fibres from one side of the tear and then pushing them into the fibres on the other side of the tear. You must do each section very carefully and thoroughly for the fibres to stay together. Because the felting needle is barbed, it pushes the top layer of wool into the deeper layers. The wool has properties that allow the fibres to stick together, virtually fixing the tear.
Sew the fibres together on the underside, making small stitches down the whole tear. The seam will already be together from the felting needle, and the thread will secure it. Make small, superficial stitches so the seam is not visible.
The sewing step is not necessary for a small tear, but it can be done for extra protection.
Felting needles are barbed and very sharp.