my mother is a textile artist... she just loves to knit and stitch and crochet and all that stuff, and i'm thinking about the idea of a canvas sheet... if you cut it across the bias, like a diamond against a bigger square, the natural tendency of the fabric is to readily stretch and drape over whatever you put it on

like, the most stylish stovepipe jeans - they are expensive because they cut them 45 degrees, across the "bias" - so they call this type of cut "bias cut" and it lets you take standard weaves and let them wrap around curves a lot better

so, if you are following me - what i would suggest is to get heavy canvas in a pretty decent size, something that you can cut a diamond from the square you get, or stitch together a bunch of smaller squares cut as diamonds from the base (think of 4 sections) and because of the way that the fabric naturally will cling by gravity over the curve, you can probably wrap it over top, then spray the top side with polyurethane water sealant, and then flip it inside out and the drape of it will still favour to keep with the dome shape of the curve

then, just stitch in some tabs with those metal rings, and you could have it tied down over 4 points around the sides of the yurt, it would look attractive and do exactly the job you need, and given you pick a silver or blue colour for it, it should last maybe as long as 5 years and be minimal maintenance, and have a kinda arty look about it

just a thought... i am a big fan of bias cut, always dreamed of making cargo pants in a bias cut so they are super slinky