Here's why:
* Disguise Numbering: There's no official system for numbering the disguises in the game.
* Variety of Disguises: The game features many different costumes and disguises, each with their own purpose.
Some examples of disguises in LEGO Star Wars: The Original Trilogy include:
* Stormtrooper: Used by Luke, Han, and others to infiltrate Imperial facilities.
* Imperial Officer: Used by Leia to infiltrate the Death Star.
* Jawa: Used by Luke and Han to blend in on Tatooine.
* Wookiee: Used by Chewbacca to disguise himself on Tatooine.
It's likely that "disguise four" is a term used by players or fans to refer to a specific disguise, but there is no official name or number for it.
If you have a specific disguise in mind, you can tell me what it looks like or what its purpose is, and I can try to help you identify it.