Hero Sweater Isolation

I shot a grey merino sweater on a mannequin in-store and I need the image on pure white for the online hero tile by [deadline=5pm]. The background has crates and mannequins' stands; the sweater edge has loose fibers and the stand casts a thin shadow. Diagnose whether an automatic select-and-mask pass will be safe across the torso and sleeves, or where I must switch to a manual pen path. Recommend the exact sequence: remove stand, then deep-clean edges, then recreate a subtle ground shadow. Flag the danger spots that create halos or chopped fibers and give one firm rule I won't break (for example: don't over-sharpen fiber edges; preserve 2–3 pixels of natural fuzz).