instead , here they still were , one woman growing toward the end of her courses , thin , disapproving lips in a thin , disapproving face , tiny apple-breasts under her high-necked dresses with their choker collars ( the neck , she frequently told susan , is the first thing to go ) , her hair losing its former chestnut shine and showing wire-threads of gray ; the other young , intelligent , agile , and rounding toward the peak of her physical beauty .