For me, skirt colors are pretty basic.
When I'm mixing and matching my skirt colors, I try and remember that contrast and natural colors are what gets the fish's attention here in SoCal, where our lakes are clear most of the year. For me, it's browns and greens, with purple flake and some chartreuse for contrast. Reds in shallow skirts add a blood hint, too.
For deeper jigs I'll use black and purple, because those colors are the ones that show up best at depth.
But I keep the accent colors, like chartreuse and red, to a minimum, so they are hints, not main themes.
In the late winter and early spring, when the bass first come shallower and are eating crawdads heavily, I'll add a little more red to my brown jigs, but that's the only time.