Are there any tutorials or can someone give me some proven directions on how to dye a khaki suit to a nice shade of GB1 gray? Thanks.
Not really a tutorial, but I asked the same question at Proptopia and received a bunch of helpful info.
http://www.proptopia.com/viewtopic.php?t=1270&highlight=
The gist of the suggestions was…
I also added laundry detergent to the mix, per the direction on the Dye box.
For my suit and pads, I used 2 boxes grey, 1/4 (or so) box black, 2 cups table salt, and 2 tablespoons laundry soap.
Let it mix for a bit, shut it off and stuffed in my suit and pads. Let it all sit (make sure you submerge the suit completely with a coat hanger…) for about 1/2 hour, then finish the cycle, including full rinse.
Then scrub the washer’s lid after it’s all done so your significant other doesn’t murder you in your sleep. 
Russ