Without a doubt, invisible zippers give a much cleaner and more professional finish to garments – particularly for side and back openings on all types of garments. Because they are a very different application to your standard zipper, they may.
Let's knit it! Fingerless gloves or mitts, call them whatever you like; some people call these hand-warmers for they only cover your hand and not the fingers or sometimes half of the fingers. Some of you might call these wrist-warmers for they are.
Couching is simply sewing a heavy thread in place with a finer thread. Its a retro technique, too, that was originally done by hand, but it works beautifully by machine as well. I use a zigzag stitch to secure the heavy thread in place.