I use to make a ton of flipping jigs and spinnerbaits years ago. Just for myself I made around 25 to 50 dozen a year. I worked with living rubber and silicone skirts. Here is a link to to a tackle dealer. If you use a bunch it will be cheaper to buy in bulk. I had a place in California I bought from But I can't remember the name of the company. I had a lot of productive patterns that you just couldn't buy prepackaged. Here is the link. I sure hope I am not breaking some guidelines by posting this.
http://www.jannsnetcraft.com/skirts-material/