One Sunday potentially not too long ago, in a land perhaps not that far away, I wore a blue shirt with a green tie. It was a second Sunday. I remembered Max's comment on my previous post about just such an ensemble.
I ended up running into an acquaintance from the blogging world (not a moho, but family friendly) who said, "I think that should be the uniform." I had been thinking that, and she confirmed it. So here, mohos everywhere, is the proposed secret combination moho outfit to be worn on Second Sundays if you should desire to express your mohoness in a (ridiculously) subtle way: a medium blue shirt and a (non-clashing) green tie.
Granted, I've seen this tie on at least one other chap here before, but I don't remember if it was on a blue shirt, or if it was a second Sunday. Obviously, this will not be a fool-proof sign, but it's a step.
Addendum 1 July 2007 - See Max's rendition of the uniform here.
Addendum 13 July 2009 - Additional renditions here and here, in response to a reviving of the "uniform" by Abelard Enigma.