How do I get the Graduation Hat in KF2?

Complete the tutorial mission. You get the achievement and the Graduation Hat as a drop.

How do I get the two Baseball Caps?

Watch the credits from the main menu.

KF2 Free Cosmetics: Graduation Hat and Baseball Caps

A short 2017 guide about easy cosmetics in Killing Floor 2 that many players miss. All three items were confirmed by the author.

Graduation Hat

While looking at the achievement list, the author noticed he had not unlocked the one for completing the tutorial mission. Running through the tutorial gave the achievement and also a free item, the Graduation Hat.

The Graduation Hat received after the tutorial.

Baseball Caps

Exploring the main menu, the author watched the credits and received two baseball caps as well.

The first Baseball Cap.

Baseball Cap, second color The second Baseball Cap.

Conclusion

It is not much, but it is free and quick. If you find further hidden rewards, the author invited readers to share them in the comments. For other ways to unlock items see achievements and unlocks.

FAQ

How do I get the Graduation Hat in KF2?: Complete the tutorial mission. You get the achievement and the Graduation Hat as a drop.
How do I get the two Baseball Caps?: Watch the credits from the main menu.