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Sew down the tie
I'm now back to a normal (0 width) stitch. Make your tie to the recommended length or maybe a bit more, fold it in half and center it along the marked line, then sew that part down.
As mentioned I use 550 cord but that's just because I have it and I don't have the nice flat fabric strap professionals use.
NOTE: you can sew the tie on later if you want. I just find it easiest to do it now.