I've decided I want curtains inside the chicken coop. 
  I'm a girly girl, I can't help it.
 
Can someone who knows fabric please tell me what kind of fabric would be the best to use for the curtains in this sort of environment?  I want something that will keep color well (because it will most likely be washed quite frequently and I don't want it to fade out).  I have a few patterns I'm totally in like with - but they're 100% cotton and I'm not sure how that would hold up for something like this.
 
Thank you in advance
 
(and try not to laugh or roll eyes)