High Fashion in Ancient Arizona

Among the hundreds of petroglyphs on and around the Agua Fria plateau is one that I consider a "fashion plate" –a very carefully detailed depiction of an article of clothing worn by a figure (thanks to indefatigable ruin-explorer Steve Hansen for the photo).
The glyph is far more detailed than the vast majority of images around it –even to the point that it's possible to make out the pattern of the fabric...

What's remarkable is that there is a fabric remnant from that period that corresponds very closely with this petroglyph.

Here's an image of it from a lecture by one of the local experts on Arizona's ancient civilizations, Peter Pilles –a piece of cotton fabric, carefully hand-knotted into a beautiful pattern at a 45 degree angle ...

...and here's a more upclose photo of the fabric (which is at the Tonto National Monument Museum if I recall correctly)...

... and a closer view of the petroglyph.

Note the similarity of the petroglyph with this ancient piece of fabric: first, both fabrics patterns are a 'on the bias', at a 45 degree angle. 

Note that on the petroglyph, there are a series of sharp triangles pointed down along that bias, as in the fabric piece.

Note on the glyph that the line of triangles alternates with a line of ninety-degree angles, just like the fabric piece.  

Note also that in the center of the glyph is a sort of angled spiral, exactly as on the fabric.

So it looks like not only was this a popular pattern, it was apparently shared over a large distance of medieval Arizona, and left quite an impression –enough to be recorded in stone. Pilles mentions in his speech that fabric quality in this area at the time was the best on the continent.

Here's another piece of patterned cotton fabric from the period that has managed to survive over 600 years, and on this piece the pattern is clearly woven in at a 45 degree angle... 

...and below is my reconstruction of the pattern based on that piece.

 

Though now that I look at it again, it's obviously not correct – they don't make patterns along a straight line like this, they're always interlinking instead.