What flag should be worn with the new (OCP) uniform? The new subdued or full color?

SPC (Join to see) - I say "full color", unless in a field environment. As long as it is not the Confederate or Gay Pride flag, I guess. [It's a joke ... no hate mail, please].. :-)

This reg is still in effect, even with the new uniform. It is no different then previous uniform pattern changes.
21–18. Wear of U.S. flag embroidered insignia
a.
All Soldiers will wear the full-color U.S. flag embroidered insignia on utility and organizational uniforms, unless
deployed or in a field environment. Soldiers will wear the subdued tactical flag insignia while deployed or in a field
environment.
b. How worn.
See DA Pam 670–1

With respect, a representation f a flag that is not in color, is not a flag, per the definition of the flag in Chapter 4 of the United States Code. So if we are to wear a "flag" it should be in color. Subdued color representations of the flag should only be worn when tactically appropriate, or more specifically, when wearing bright colors is tactically inappropriate.