I'm attempting to change the appearance of an application from the command-line using "-xrm resource" with no success . . .

For the purposes of this experiment, I was using xclock:

$ xclock -d -xrm "clientDecoration: none"

as an example. I've tried numerous variations, including the version that's in my .Xresources file:

Dtwm*XClock*clientDecoration: none

but none of them change the appearance.

What's the correct syntax for this??