Hello! I have about 10 black Fresh Clean Threads tees that have suffered the same fate. The material is 60% cotton, 40% polyester. I wash on a mixed cycle, 40C or 30C using Ariel powder, and dry on an indoor line with a dehumidifier in the room.
It sort of looks like friction as you can see in the second photo the texture of those stripes/streaks is different. Almost bobbled. I originally thought it was the dye coming off but used a Dylon dye pod and it didn’t do anything.
Has anyone seen this before? Thanks!