www.livingrubber.com has been a good source for silicone and rubber skirt material. I sold off about 100 yards of rubber skirt material in 10 colors and the jig maker was happy to get the supply since rubber is hard to get in a square cut. Rubber deteriorates and needs to be retied every 2 years or so, but silicone doesn't have the action that rubber does. Silicone is great for colors and patterns, though I'm not sure the fish care that much. Last year I tied the following combos with rubber and caught fish all season: black, purple and kelly green; black, green and brown; all black; black, blue and lt blue.
Flashabou is great for irridescent hair and Cabelas, Jannes Netcraft, Stamina, and others sell it on their sites. Great for making flash jigs.
Marabou is nice, as is deer hair. It comes down to how much flutter you think you need in a hair jig. Buck tail has done fine for me, especially if I add a bit of flashabou. Some people use rabbit hair, which I equate with the fineness of feathers and rarely use feathers except as an attractor to the rear hook of a popper.