Sorry mate. I'm going to have to tell you that it's ******.
Acrylic never goes back. Chances are it went in on more than 40 degrees in the wash.
My ex cooked a sweater of mine at 60+
I'd only worn it once before that
Suggest you put it out of sight/its misery as it will only cause you distress every time you see it.
Becoming an oily rag is an ignominious end for any item of clothing....
