I ordered a medium indoor cover for mine from morethanpolish.com based on a recommendation here. It’s a black very stretchy/soft material and hugs the body nicely. It’s got a nice weight to it too. To be honest the medium is a tiny bit big and I think a small would do. They send with DPD so delivery is no hassle.
Their description is “Stretch Blk - Satin Stretch Indoor Car Cover Colour Black size Medium 430 x 165 x 120cm”.