My husband made a few proposals how to name this embroidery : flying hot dog and similiar names - I call it "flowing through" - it is the wave stitch of SharonB's Pintangle - you can find more of this at http://www.flickr.com/people/stitchinwoman/

Wave stitch

I had no better idea but to fill in some space between the buttonhole eyelets. Of course, I made it crazy, straight stitches would not fit in my sample which is all wavy