From TF2 Wiki
Bill's Hat is a promotional headwear item for all classes. It is a slightly worn team-colored beret, with the yellow shield insignia, or "flash", of the U.S. Army's 1st Special Forces Group. It is styled after the hat worn by the eponymous William "Bill" Overbeck in Left 4 Dead.
Bill's Hat was awarded to players who had pre-ordered Left 4 Dead 2 on Steam or for PC through GameStop before November 17, 2009. The hat became vintage if you had the hat before the poly count update.
- Bill's Hat was added to the game
- This hat was made paintable.
- [Undocumented] Added a community-contributed description for this hat.
- The hat's painting texture was improved.
- Made this hat always tradable.
- Fixed not being able to see the correct colors for painted hats when running with DX8.
- When equipped on the Soldier, this hat moves around on his head in the same way as the default helmet. This causes the hat to slide around on his head during certain taunts, such as the Shovel and the Director's Vision.
- A wrapped Bill's Hat will appear as "L4D Hat" on the gift's description thumbnail from within the sender's backpack.
- Sometimes when equipped, this hat has been known to not be securely fitted to the players head. Instead, it is hovering above the player.
- Bill's Hat has its own backstory: "While conducting a science experiment on parallel dimensions, Bill's Hat fell off a table into the Team Fortress universe."
- The beret flash on the hat is that of the 1st Special Forces Group which is based out of Joint Base Lewis-McChord which is near Valve's headquarters in Bellevue, Washington.
- Some people had lost their Bill's hat due to glitches, updates, etc. Valve compensated for this by restoring it to them with vintage quality, raising its value greatly.
- Scout bill.png
- Soldier bill.png
- Pyro bill.png
- Demo bill.png
- Heavy bill.png
- Engi bill.png
- Medic bill.png
- Sniper bill.png
- Spy bill.png
William "Bill" Overbeck, featured in Left 4 Dead
First promotion photo from Steam popup
- Tf2 bills hat preorder thanks popup.jpg
Second promotion photo from Steam popup