This is the stunning Designers Guild Appia velvet reference. Available  Oyster colour Oyster (Silver Birch now out of stock).
 
Retails: £89/m

Its official description is: "A very soft washed plain velvet in a brilliant range of colours for super luxurious curtains and highly durable upholstery"

Composition: 60% Vi 32% Co 8% Pl

Measurements as follows: Oyster 140cmW x 45cmL 

The Appia reference belongs to the Mattiazzo fabric collection: "A sumptuous compilation of our most popular and best selling velvet weaves in a stunning palette of shades from cool naturals through richer tones to signature brights and soft to the touch for beautiful curtains and upholstery."