At various times, people have posted shaders for the Fifrefly rendering engine which generate diagonal stripes, with some ingenious use of math nodes. But, by using the U_offset or V_offset inputs you can tilt any pattern. This particular example uses the Tile node to generate stripes. Connecting the V_variable node to the U_Offset is all you need to do. The more you tilt the stripes, the narrower they look, because you're not rotating the pattern, you're sliding it sideways. And if you want a diagonal mesh, use the mortar for the strands and the tiles, set to the same colour, for the holes.

what does the collapsed texture coodrinate look like opened?

Here's the same thing with a texturemap. This is a bit more complicated because you need to add a fixed offset and work on both the offset controls to prevent distortion and control the positioning of the image edges.

Those "variable" nodes are just a white-to-black transition in graphical terms, white at one edge, black at the other. They're just the coordinates in UV space.

very cool!