Here is the link to my archives, a post about Star Wars sewing costumes.
Star Wars Costume Patterns
Some patterns are sold with the Star Wars license (see Simplicity 4426). Others have been made to look just like Star Wars costumes but with generic names and no licensing (see Simplicity 5840). These patterns apparently go out of print. I guess some pattern companies just don't understand the wants of their customer base. Even if it's not the year that a Star Wars movie was released there are always children (and some adults) who want to make a Star Wars costume!
The patterns I own are Simplicity 4426 and Simplicity 5840. If you want to see what they look like to a google.com image search.
If you are looking to buy an out of print sewing pattern check eBay. You may find used pattern sellers individually selling on their own websites but buyer beware.
Also go to the largest sewing store near you and browse the patterns. You may find one that is a general pattern that you couldn't find due to using a keyword search that was not an exact phrase match.
Good luck everyone and an early Happy Halloween to you!
Note: I was not paid to mention these products, I bought these for our family's personal use.