Spot the bug - #143: Weather Bot Attire

Why does my weather bot always suggest an umbrella?

function getAttire(forecast) {
  switch (forecast) {
    case "rainy":
      return "bring umbrella";
    case "snowy":
    case "hailing":
    default:
      return "wear coat";
    case "sunny":
      return "wear sunglasses";
  }
}

Reply with what is broken and how you would fix it.