This Doctor Who screencap contains
fedora, cappello di feltro, homburg, stetson, stetson trilby, paglietta, livorno, panama, cappello panama, marinaio, skimmer, il cappello di paglia, cappello di paglia, cappello campagna, and cappellone.
There might also be
sombrero.
Basically the story of his three companions, Rose, Martha, and Donna, and how they can never stay with him long, and the Doctor has to let them go. Made da zcatz.