The only team that comes to mind that have consistently pulled off true orange and green uniforms is the University of Miami Hurricanes teams, and even they have got it wrong regularly throughout their history.
I couldn't find a good picture of one of their all orange uniforms, but their best look in modern times is when they are one solid colour (generally green) with minimal amounts of the other two.
You definitely need white in there as well (or another shade depending on the jersey and the shades of orange and green you are using) otherwise the colours clash and it just doesn't work.