Whenever I start to wear out a pair of khaki pants I buy two boxes of rit dye (Forest Green and Brown). Read the direction on the box to use the correct amount of dye that will be needed or add more or less depending how light or dark of a shade you want. Once I have prepared the dye I twist the legs of the pants together, then I dip the pants into the first tub of dye (it does not matter which color u use first) and let them soak according to the direction on the box. When you remove them let the pants dry a bit and then twist them in the opposite direction and soak them again in your second dye. When you remove the pants and they are completely dry you should have a new pair of camo pants with various shades of khaki, brown, and green. It doesn't cost very much for the dye and the final product looks pretty sweet and you will be the only guy in deer camp with that pattern.