I don't wear them anymore, but when I was younger (maybe 9-13) I had a tux (tails, tophat, the works) that I wore for performances that I'd picked up when a local clothier shut its doors. At the time, the only accompanying ruffled (yes, I know) shirts I could find to fit my neck were FAR too long in the sleeves. A similar product was purchased to adjust the sleeve length. They worked rather well, if I remember correctly, though they might not have been the most comfortable solution. Now days, I just try to buy the correct size, or barring that, take it to a tailor.