I remember a previous thread, and since I wanted a cheap, ultralight wind/rain layer, I ordered a Tyvek suit from Amazon for less than $8 (first picture). Thing is, I look like the Michelin Man or the Pillsbury Doughboy in it and took quite a ribbing the first time I used it camping. Plus, that ultrawhite Tyvek material shows every bit of dirt or stain.
So I got some black Rit dye, Kiwi leather dye, and some acrylic ink. Per the previous thread, the Rit dye barely did anything (second picture), and the suit came out a very light gray. So I tried the leather dye, and it worked OK for a darker gray (top part of the third picture). But the acrylic ink worked best of all, and came out nearly black (bottom part of third picture). Plus, it is much easier to brush on than blotting on the leather dye with the little sponge applicator on the bottle. The acrylic ink is $8 for a 5 oz bottle from Amazon.
Hopefully this is not all old news, but I wanted to share it in case it's not. $16 for a windproof, waterproof, breathable, ultralight, head-to-toe rain suit. Haven't decided yet whether I will keep the booties on and wear them inside my shoes, or cut them off.