Tired of white gis and wishing there were more affordable options out there for colored ones, I decided to dye them myself. I bought Procion MX, a fiber reactive dye far superior to grocery-store Rit dye (because you don't have to do it in hot water) from Dharma Trading Company online. I also bought all the other stuff you need-- urea (nitrogen) to make the powder dye paste up (dissolve) better, calsolene oil (lowers surface tension of the water, reduces streaking), soda ash (fixative), etc etc. They also sold textile detergent that keeps the dye from resettling on other colored areas (like in tie-dyes, or on the rubber gaskets in the washer) and an industrial-strength fabric softener since the dyeing process stiffens the fabric a bit. For you BJJers out there I highly recommend this fabric softener, it turned my Gameness gi into silk :)
The dyeing process was remarkably quick and simple. It took about 12 cups of non-iodized salt per gi, in a big rubbermaid storage tub... rubber gloves... about 20 minutes dyeing time and another 30 of fixing, then a trip through the washer. Both the blue ("baby blue") and yellow ("citrus yellow") came out stronger and brighter than I hoped/expected. Actually, I followed the instructions on the blue to the letter, except put 4 ounces of dye powder in instead of 3.2 oz... when I did the yellow gi, I saw in the first couple 2-3 minutes that it was waaaaay brighter/darker than I wanted, so I immediately mixed up some fixative to stop the process. Instead of dyeing the yellow for 20 minutes it was only 4... but the fixative made it appear even darker for a minute (think high school chemistry titration reaction) so I only put in about 1/5 the amount of fixative and basically stopped fixing it after about 5 minutes. I was hoping it would "relax" the intensity of the color, but as you can see, not so much.
None of the Gameness patches were cotton, so they didn't take the color, fortunately. The other gi was an off-brand with cotton embroidery, and the white took on the yellow. The red trim still looks good though.
I still have sage green, peach, and Chinese red dyes to try out. I shamefacedly admit I will probably buy another one or two cheapie gis so I can experiment with tie-dyeing a gi. :)