I'm primarily a garment sewer and there are times when using clear elastic in a neckline or shoulders would be a good idea. Alas, I have a mostly hate-hate relationship with clear elastic -- it likes to wriggle away and generally be a pain in the elbow. Someone recently posted a link to Londa R's newsletter where she showed her method for applying clear elastic to a neckline and it works very well. She sews it on a 5/8 inch seamline rather than the 3/8ths that I usually try -- the extra 1/4 inch makes handling this SO much easier. Then she turns it under and topstitches with either a double needle or a coverstitch and then trims away the excess.
I still have trouble coaxing the elastic to stay where I want it so I looked through my collection of feet. Bernina #22 to the rescue! This is a cording foot with a little gate to keep cording in place. I fed the elastic through that little gate, under the foot and out the back. Holding the elastic behind the foot and in front of it kept the slippery stuff where I wanted it. Magic! I'm sure that most machines have a similar foot. Perhaps you have another method that works but if not this is worth a