On this page of the guide to Star Wars Jedi: Fallen Order, you will learn how to change the appearance of the main character and other elements of the game world. These options don't affect the course of the game, but they can make the game more fun.
You can't change Cal's appearance. However, you can change his outfit. You can choose a different poncho for him.
New ponchos are earned by making progress in the game.
Some of them can also be found as loot. All cosmetic changes are done in the Customization tab in the pause menu.
Besides changing the appearance of the poncho, you can also determine the type of material of the hero's costume.
The changes aren't for Cal only. You can change BD-1's appearance by choosing from different skins,
The Mantis spaceship also has different skins.