So if something has natural fiber and is black, you can bleach it to a sometimes surprising color. Mine turned similar colors, but I hear it can go different ways!
I wet everything in the tub. Used the shower head to both warm the water and then wet everything well. Fill tub to cover clothing with hot water then estimated a cup of bleach. I added some water I boiled on the stove and swirled the clothes a few times. I let it sit maybe 20 minutes? Washed as regular with some white towels and pillowcases (pink eye, so figured bleach a good idea!)
I'm so thrilled with how the blazer turned out. I didn't think it would go at all!