Although it is brown when received, it can be changed to a light green colour by covering it in ectoplasm, making it a ectoplasm-covered bedsheet. To do this, players must dip it into the pool of slime on the bottom floor of the cavern beneath the Ectofuntus or dip it into a bucket of slime collected from the pool. Although this is supposed to make you resemble a ghost, when talking to residents of the port, they will merely joke at you.
When worn, the bedsheet makes the player resemble a classic "bedsheet" ghost. The bedsheet is not wearable in any other place than Port Phasmatys; attempting to do so will result in receiving a message, stating: "I'll only wear the bedsheet inside Port Phasmatys."
It is impossible to run or rest while you are wearing a bedsheet. It is also impossible to charter a ship if you have it in your inventory or are wearing it.