This is the beautiful Emilie fabric by Designers Guild.
Its official description is: "A plethora of exquisitely drawn botanicals, florals and foilage are shaded to stunning effect and are set against a graphic, geometric background for a unique, tailored feel. This design is digitally printed onto pure cotton, making it the perfect fabric for stylish upholstery, curtains, blinds and cushions"
This particular piece measures 93cmL x 136cmW and comes in the Platinum colorway.
Please note that there are a few hole punches along one edge (as shown in the last picture). The measurements indicated start from after the holes.
The Emilie fabric belongs to the Giardino Segreto collection, "An inspired collection of refined prints expressed in exquisite watercolour, paint and pencil shaded detail. In varying scales, this stunning collection is printed on linen and cotton in new combinations of sophisticated and timeless colourways. A perfect collection for elegant curtains, blinds, cushions, bedcovers and upholstery."