![]() There are actually lots of different weights of thread but most are only available to manufacturers. Topstitching thread sits on top producing a nice look. Regular thread is smaller in diameter than the warp & weft of most denim so it tends to sink into the weaving and become hard to see. It's also stronger, but unless you also put it in the bobbin this isn't significant (and 3 rows of regular thread are plenty strong). It is just thicker, so it is more visible. In this instructable I've used orange thread in the bobbin, white for the regular thread, and light green for the topstitching, so they are easily distinguished in the pictures. Note that there's no functional reason not to use the same thread for the topstitching, but the heavier thread looks nicer. You'll need regular thread in the bobbin, and two spools of thread in the top of the machine: one regular for the construction stitch, and one of heavier topstitching thread for the decorative topstitching. I usually use a similar seam that's nearly as strong and a lot easier, which looks the same on the outside of the garment. It's slightly arduous to do the true kind without the specialized machine, though. A true flat-felled seam can be made on a home sewing machine, although in manufacturing a special machine is used that only does this kind of seam. They're also often used on tents, outerwear, and anything where you really don't want a torn seam, or frayed edges. ![]() Flat-felled seams are used for strength (and decoration) on nearly all jeans and denim clothing.
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