I'll give you another old seamstress' technique I've used with success. Use a large sailmaker's type needle, and a two foot long piece of a relatively coarse, fuzzy thread. Push the point of the needle into the exact point at which your loop emerges from the cloth, all the way through the fabric and linings. As you draw the coarse thread through, it will "grab" the loop and pull it back into the fabric. If it doesn't work the first time, you probably have not placed the point at precisely the location of the pull. Repeat. I once used this technique on a silk/wool Corneliani sportcoat that had a huge loop of silk disfiguring its lapel, and had consequently been marked down to under $50. The technique worked perfectly, and I still have that jacket.