Brooches and Garments
The 1,2,3, set brooches are not suitable for every fabric. Therefore, it is better not to pin them in delicate or in thin fabrics.
You need to pin the brooches gently in a seam or in a board of your sweater or a looser or coarser knit but not a too heavy knit.
If you don't have this option for a particular garment, make sure you don't break any thread from the fabric if there are permanent holes.
When you take off a brooch you will see that there are holes in the fabric, you can rub the fabric very gently until the holes are vanished. The "hole" is the space created by the pin. After a wash, the holes usually disappear.