Thank you, mauriz. I had always wondered how these detached 'clips' are fastened to fabric. They are different from the earrings we call clips; the prongs go through the fabric rather than around it. Sometimes the Duchess of Gloucester wears clips at the edge of a collar, which could involve the earring style clip. But the Queen wears hers as pairs of brooches, which necessarily involves piercing the fabric. Very interesting to see those fork-like prongs.