There's stuff that bleeds before you wash it but not after one wash.
I just got a shirt and halfway through the first day I wore it I found some manufaturer's note in the pocked saying that the colors could come off on your clothes before you washed it but that after you washed it once (which was supposed to be by itself with no other clothes because it might bleed a bunch) it would be fine. Well, it was already on and it did not smudge. 'm too cheap to wash anything by itself so I just washed it with some old towels since if it bled on them I wouldn't have cared, and that didn't happen either. But theoretically it needed to be washed once before wearing or it could smudge other clothes.