Quote - But still, the triangular mesh looks more like natural cloth. So why can't you have both?

Quad mesh is easier to model and consume less memory, but triangle mesh are better for conforming and dynamic clothes and any deformable object because its normal are always correct after the deformation. A quad  after a deformation can produce a degenerate quad and so have wrong normals and can produce undesired illumination or black spots in the rendered image.

Stupidity also evolves!