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Look at the stitching on your underwear. One side has more thread than the other! There's a single line of thread on one side, and two or more on the other.
It is not the basic lock stitch. It is a chain stitch, just like granny crochets, except penetrating the fabric. Whereas the lock stitch is two interlocking threads, the chain stitch is a single thread, looping around itself.
See how it's all loose on the bottom? I guess that's where the give comes from. The point of this all is that the stitching has to stretch, not break, with the elastic.
The downside, as you may have discovered, is that when the thread breaks, you can easily unravel the whole thing.
It is not the basic lock stitch. It is a chain stitch, just like granny crochets, except penetrating the fabric. Whereas the lock stitch is two interlocking threads, the chain stitch is a single thread, looping around itself.
See how it's all loose on the bottom? I guess that's where the give comes from. The point of this all is that the stitching has to stretch, not break, with the elastic.
The downside, as you may have discovered, is that when the thread breaks, you can easily unravel the whole thing.
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