|I have only done this once, but it worked really well for both marking symbols and for telling right side from wrong side. When you have the pattern cut out, but before you move anything, take a needle and thread, and run the needle (thread knotted) through the symbol on the pattern and both layers of fabric (then cut the thread on the needle side; I would leave longish tails when you cut the thread). Carefully lift the pattern and fabric together, and do the same in reverse from the other side where the first needle exited. When you have done all the symbols from both sides, gently remove the pattern (a small hole will be left in the pattern) and then separate the fabric layers. The cut tails of the thread will be on the inside once you pull everything apart; the inside is the right side, usually) Now you can tie or loosely knot the thread if you like, although it worked fine for me to leave it unknotted on the wrong side. You'll have thread marking each symbol, and the longer cut tails will be on the right side of the fabric.