homochrome

From my Word of the Day:

Many words start with the prefix HOMO-, same. A HOMONYM is a word with the same sound and spelling as another which differs in derivation and meaning. HOMOCENTRIC means having the same center; HOMOCHROMATIC means of the same color; HOMOGENOUS, of the same origin; HOMOGENEOUS, of the same sort or kind.

I'm going to start complimenting people on their "homochromatic" outfits. I'm sure they'll love that.

Here, for instance, is a homochromatic outfit (and, in fact, a homochromatically-dressed group of friends):