This article contains spoilers for Ghosts season 4, episode 4, “The Work Retreat.”Despite the spirits at Woodstone Mansion being bound to the outfits and accessories in which they die in Ghosts, Isaac (Brandon Scott Jones) lets his hair down in season 4. The Revolutionary War soldier has had a big year so far. He is recovering from being kidnapped by a Puritan ghost named Patience, having been to her underground cave in the Ghosts season 4 premiere. All this transpires after Isaac leaves his fianc, Nigel (John Hartman), at the altar in Ghosts season 3’s ending. Now, Isaac is focusing on personal growth in season 4, episode 4, The Work Retreat.

https://screenrant.com/ghosts-season-4-episode-4-isaac-hair-change-explained/