Absolutely essential, the black with white is super in this style! Jess and Jane is using a very travel friendly fabric that is 95% polyester and 5% spandex called ITY or Interlock Twist Yarn. ITY is a cool and fluid knit fabric with incredible drape. This is a simple pull on top with 3/4 sleeves and a round neckline. We love the solid border hemline for a layered look. Feels silky.