Medic student hat (will also works for the other classes) 
By PKSpark, hosted on FPSBanana.com

Put the model files: 
all_domination_2009.dx80.vtx,
all_domination_2009.dx90.vtx,
all_domination_2009.mdl,
all_domination_2009,
all_domination_2009.sw.vtx,
all_domination_2009.vvd, int the following path:
steamapps/<yourusername>/team fortress 2/tf/models/player/items/all_class


Put the material files all_domination.vmt and all_domination.vtf in the following folder:
steamapps/<yourusername>/team fortress 2/tf/materials/models/player/items/all_class

It replace the ghastlier gibus 2009
Have fun!