Cutting knit fabric on the bias?

Knit fabrics are a lot more fluid than woven ones. They will drape far more-- for lack of a better word-- slinkily than wovens. You want a knit for this to be as slinky and form-fitting in the hip/waist as the example you're showing.

I looked at the video and I'm fairly sure if you lay it out flat, it's just a square with a hole in the center, and the extra fabric where the points of the square are simply allowed to fall from the hips. It's a striking and deceptively simple garment; but I think it's cleverness is all in the shape of the garment itself rather than the way the garment piece is placed on the fabric for cutting.

Had you considered mocking up a version in miniature in a fine knit fabric to test it first? If I weren't willing to sacrifice some fabric, I'd use a kleenex or a paper towel and an empty glass bottle... something with a waist like the empty ginger ale bottle sitting in front of me.

Cut out a square, cut a hole in the center and drape it over your bottle and see what you get.

Hope this helps!

Cutting Knit Fabric

you may make bias tape from knit fabric besides the shown fact that it is not mandatory simply by fact the fabric has it somewhat is own stretch. in basic terms shrink a band the required width around the fabric and use an identical way as bias. you may stretch it very extremely as you stitch it directly to grant a miles less assailable end on your garment. it somewhat is used precisely an identical way as ribbing, yet you may desire to allow for the shown fact that it has much less stretch!