Having introduced 5 chord shapes for DADGAD tuning, let's turn our attention to open D (aka D A D F# A D). As with DADGAD, drop the sixth string down a tone to D, then drop the first and second ...
With G as our root, we pass the muted fifth string, then the open fourth gives us the 5th of a G chord (D). The third string A gives us a 9th, then another 5th (D) on the second string ...