With a shawl ring, 90 Carrés
can be worn in a loose and soft style, the effect is more like
draping than knotting. The key is to fold the scarf into a wide and
loose basic bias fold
ends secured with the basic slide method
ends secured with the basic slide method

As above, only twisting the folded scarf before securing the ends, and leaving one end longer

Below: fold your scarf into the basic bias, and feed ends through a shawl ring, both coming from the same direction
Scarf folded into a rectangle, ends secured with a basic slide knot. Please click here for a how-to (note: the video shows the basic slide with a scarf folded in the basic bias, but the method is the same with as with a rectangular fold. Dont wrap your scarf around the neck first, but let the ends hang down your front)

as above, only with the ends tied in the basic slide

Below: the scarf is folded into a rectangle with the ends secured in the basic slide.