Custom Printed Fabric
I've been tinkering with this for a good while now. I will have swatches at the 40th Anniversary Convention. If you're comfortable with Photoshop, the process is fairly easy. When you upload your design you have the option to set the repeat how you prefer.
Columbia's Pajama Stripe - This was printed by Spoonflower. I have experimented with the colors a bit, and though I think my final result is a bit dark, it lends itself well to natural fading for a truly "worn" look (you can accelerate the process with sun exposure and many washings). Spoonflower will also let you modify the colors before ordering, however I strongly recommend getting a swatch before purchasing yardage.
Brad's Bow Tie Plaid - I tried this on Spoonflower originally and I wasn't happy with any of the results. Every effort looked dull and faded - as if getting a saturated red was impossible. I tried using their color-picker, and talking with customer support on the phone. Always the same dull results. I had much greater success with FabricOnDemand.com - the only complaint I have about them is that they do not have a store feature to let other people buy my designs directly.
Brad's Cummerbund Plaid - Pretty much the same exact experience as the bow tie plaid. My final results were from FabricOnDemand.com.
Janet's 1/2" Pink Gingham - Gingham is technically a woven plaid, but I've done my best to simulate the effect with printing. I got great results from Spoonflower.com so it's available in my shop there. I also have a lighter version of the same print for Janet's that are working with a lighter pink dress fabric and still want a good match.