I know this is kind of an obscure topic, but it's one I kind of find fascinating, because of the rarity of both happening and documentation when the internet was just Al Gore's pet project.
But, in the 80's there were a number of instances of secondary jerseys and color vs. color match ups. The Utah Jazz for instance wore their green jerseys at home a couple times for St. Patrick's Day -- once against the Lakers, whom were wearing their purple roads.
Then again in 1986 during Karl Malone's rookie season. The unique thing about this occurrence was that the Jazz didn't wear their green jerseys as their main roads -- they switched back to the purple jerseys the previous year. But, the match up again was on St. Patrick's Day and this time against Detroit wearing their road jerseys.
I know there were a couple instances of teams wearing secondary jerseys -- I believe the 1983-84 San Diego Clippers wore both red and blue road jerseys and I believe the Pacers wore white and gold home jerseys (maybe on the road too?).
I was wondering if anyone had any other examples or were familiar with this era's history. Again, it fascinates me, probably more because it's a real hunt to find documentation.