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Knits, stretch fabrics, and fabrics that fray easily are usually best finished with a serger. This makes them nice and neat and unlikely to unravel on you. Great, right? Sergers, however, are incredibly expensive (unless you buy a cheap one that breaks 2 months later) and not worth the investment unless you're looking to become a professional seamstress. So if you don't want to shell out money for a serger but you still want to finish your fabrics in a slightly-professional manner, you'll need to use a zigzag, or even a double zigzag, to give your seam finishes a decent look.
Before you begin finishing your seam, press it flat. You can do this by either pressing the seam allowances open or closed. Open results in a flatter seam when everything is finished, but closed looks more like a professional serged edged. It's really up to you. Remember that if you're ironing the seam allowances closed, you'll be stitching them together with your zigzag. If you're ironing them open, you'll be stitching them individually.
Either way, iron your seam before beginning. Once this is done, stitch a wide or medium-wide zigzag stitch near the raw edge of the seam allowance. If you're not sure what size stitch to use, practice a bit on a scrap piece of fabric. Change your stitch widths a few times and see what works best. In general, you'll use a wider stitch for heavyweight fabrics and a narrow stitch for lightweight fabrics, but this is only a guide. Use what works. You can trim your seam allowances if you like, but be careful not to clip the stitching or you'll have to start all over again.
The zigzag seam finish is probably the most common finish for most of us (including me because I have a love/hate relationship with my serger). It tends to be the go-to seam finish, but don't be afraid to experiment with others.
Sheer and delicate fabrics are some of the most difficult to work with, especially when it comes to finishing a seam. Delicate fabrics sometimes fall apart when you try to finish a seam using your sewing machine, so it's often better to do so by hand. This is the gentlest way to finish off your more delicate projects.
The hand overcast method might sound self explanatory, but it's not, not really. If you don't do it right, and you don't keep it consistent, you'll find yourself with a seam finish that bunches. Start by ironing your seam open and flat, but use a very low setting. Delicate fabrics don't like a lot of heat. That's one of the many reasons they're labeled 'delicate'.
Once your seam is flat, hand stitch diagonal stitches ⅛" from the raw edge of the seam allowance. Make sure the stitches fall diagonally and that you don't pull too tight. You don't want the fabric bunching. Take your time. You'll want to make sure the stitches are ¼" apart. Keep it consistent. If this is difficult for you, consider pinning a piece of graph paper to the seam allowance as a guide. Even stitches that aren't too tight are the key to this delicate seam finish.
