Now that you know what you'll use your "night pants" for...let's get back to patch material, and allow me to make a recommendation. The 2 most common materials I see folks choosing are a striped 100% cotton fabric often referred to as "pillow ticking", and Denim.
The most frugal among us use their old worn Blue Jeans. Unfortunately, old worn blue jeans don't offer uniform thickness, so you will see variations in the tightness of your loads, with resultant opening of your groups when you're trying to shoot for maximum precision.
For a good Denim option, with my rifle, I've found buying NEW 10 oz. Denim material to provide uniform patch material. Very tough, and shoots well.
Of the Striped "ticking" products...I've seen 3 different colors...Blue, Tan, and Red. I've also observed significant variation in thickness from store to store. Some just right, some that despite their being "blue-striped pillow ticking"...were measurably too thin for my purpose.
I emphasize the measuring because the best way to identify patch material is to purchase a decent micrometer and take it along when you go fabric shopping.
Keep notes on what you find, both "uncompressed" measurement(twist the handle of your instrument until it ratchets) and "compressed" which will be a bit more subjective but with a little practice you will know what you want.
Once you find a material that works well...go back and buy a bunch of it.
Sorry to get so wordy. If you're not obsessed with precision, your old blue jeans will probably work just fine. :thumbsup:
For more on the topic, if you haven't already done so, get hold of Dutch Schoultz. :hatsoff: