What changes do we see in Cass and Tilly in Chapter Eight?

The physical transformations of both Cass and Tilly at the beginning of Chapter Eight can be seen as echoing inner, emotional/spiritual transformations. As they are both discovering comfort and value in who they are and who they can be (again, thanks to the literal and metaphorical mirrors provided by Delphine and Calinda), here they both discover comfort and value in physical attractiveness. For Tilly, that value, that sense of inner beauty manifesting externally, is reinforced by the reaction she gets from Dr. Hutchings at the showboat performance.