What an interesting idea! Do you sew it to the sock or just to the bun itself? I guess I'm wondering if it would work for a regular bun (no sock). I'm wondering what I would secure the thread to, both at the start and at the end of the sewing process.We do not use bobby pins. Instead we use a C needle and thread (fishing line or embroidery thread works well) and sew the bun in. This flattens it and secures. We never worry about it falling out. Works for us.