Make sure you spend some extra time smoothing with the moleskin. The moleskin needs the heat from your skin to really adhere to the fabric.
At the fabric store, you can find packages of two-sided fabric adhesive sheets. Some of these are iron-on, but for this project, using one that doesn’t require ironing is better, as it’s not a good idea to iron some bras.
Once you’ve got it backed, trim up the edges. Also, round off the corners so that they don’t poke you later.
To double thread a needle, smooth two pieces of thread together. Cut the end so the pieces are even. Push both pieces of thread through the eye of the needle at the same time. Leave at least 4 or 5 inches of tail so that the needle doesn’t come unthreaded. An easy way to knot the thread is to find the end of the thread. Hold it up against the needle so that the needle is facing towards the length of the thread, not the end. While holding the end of the thread against the needle near the eye, wrap the thread around the sharp end of the needle three times. Put your fingers over where you wrapped the thread, and pull the needle through. Still holding the loops with your fingers, let the length of the thread go through the loops until it knots at the end. Cut off any extra thread.
Make sure to make your stitches close together to keep the wire from escaping. Also, it’s probably a good idea to sew a little bit farther than you think you should on each side to help reinforce it. [15] X Research source