My girlfriend is trying to finish her Harley Quinn body suit for tomorrow. She has the stretchy material left from what was the hood of the suit to make the diamonds. However, she has tried everything to attach them to the suit and it doesn't work. Stitch witchery won't hold and she fears melting the suit. She said a straight stitch is difficult because the seams have to be really close to the edge of the diamond, and the fabric is slippery and will get caught in the machine and jam. The zigzag stitch looks like trash because I have never used it before.