Ditto to that style being the result of natural volume. My hair will do that with or without product, regardless of layers if I do not have the weight of longer hair.
Ask your stylist to bulk your hair with longer layers on top.
Thick 3B/C hair, shoulder length and transitioning into my premature gray. Wen SAM or Neuma shampoo, Jojoba oil, Aveda Damage Control Spray and Flaxseed-Aloe liquid gel.