Ok, I’ve done this in the past.
Have you got an old Lycra cycling top lying around ? One you’ll never use again ?
If so cut a square about double the hole you are trying to patch, fold the new Lycra patch in half and put on the inside of the hole.. Small stitches around the patch into the lycra you are repairing then where the hole is stitch a few zig zags to keep the hole together then stitch that into the patch on the other side of the hole.
If you don’t have a cycling top try something silk, like pants.
😀