The Bottoms item in the Animal Crossing New Horizons project belongs to the clothing item. A reasonable mix of Bottoms can better decorate yourself, your home, or even an island landscape. Some Bottoms items can be purchased at the Island Shop, Able Sisters, Nook's Cranny, or Nook Shopping using Animal Crossing Bells. Bottom items that are not directly purchasable can only be obtained by repeating quests. Or simply, you can choose to Buy Animal Crossing Clothing - Bottoms here.