This technique can be used as an edge finish or in a contrasting color as a decorative stitch. It creates a flat, dashed line on the surface.
Weave some plain weave.
Use a separate weft in a matching or contrasting color.
Cut a length of weft as long as 3 times the width of the warp.
The shed is closed.
Start at the right edge of the warp.
Fold the weft in half and center it on the right selvedge thread, one half of the weft goes over 2 warp threads, the other goes under the same 2 warp threads and then they swap places. Repeat across the warp.
Notes
The number of warp threads in the groups can vary according to the look you like. You can experiment with this technique and invent different looks. The main thing is that the top and the bottom “threads” switch places.