The newest variation of nightdresses is a sleepshirt. Designed to replicate the shirt of the night suit set, this one is longer and reaches until your thighs. Longer ones that reach until your knees are also available. They have a collar and buttons all along and are generally in full-lengths. On the other hand, a nightie is simply a long nightdress that may or may not have buttons and pockets. They can be full sleeves or sleeveless. Both are great types of nightwear, and women can pick them depending on their level of comfort and personal choice.