Today I'm just adding a few pics about the progress.
When I had all the double panels sewn, I took each two of them and put them together to get four joined panels.
These sewn together by two gave me eight panel pieces - fourths of the skirt.
And so on. This is half the skirt. I'm pleased that the golden bands look like continuous rings.
Unfortunately, sister didn't buy all the velvet at once. She bought a half and next time the rest so she accidentaly didn't buy exactly the same hue. Each half of the skirt will be of a slightly different colour.
Basting the hem. Quite a long one:-)