Uchishiki Lining (2)

Yesterday I caught the light on the lining just so and suddenly saw the whole pattern. Today I wandered round the house, trying out various light sources. Ended up in front of a window at a low angle and here it is. This is the best I can do.

I have had an email back from Ichiroya saying he agreed with me re the rayon-ness of this lining and says

From around Taisho era, jinken(rayom) was often used for kimonos and
other fabrics, which were silk. Maru obi is often woven with silk and
jinken(rayon) blend, so that the lining of vintage uchishiki is rayon is
not special case, we think.
It might be the original lining ( we are not sure though ).

The Taisho period is 1912 to 1926. My textile expert says that rayon was highly regarded in the 1930s which would fit.