I have a pair of black slacks, 3/4 polyester, 1/4 rayon, that seem to have developed an odd graying/discoloration in spots.
I didn't do anything wrong care-wise, did not wash or iron them too hot, did not use bleach, etc.
I think they were supposed to be 'wrinkle free' (which they aren't...), could it be some sort of coating coming lose, like teflon flaking off a cheapie fry pan?