I've been told all he needs is his hat, but to me the hat is for Abe Lincoln, the President. Maybe when he retires his arm cannon and returns to office he'll don his stovepipe again, but while adventuring it would just get in his way.
XMO Wolverine Movie Sabertooth - Head, Arms, Legs
Indian Jones Henry Jones Sr. - Torso
Golden Compass Lee Scoresby - Coat
Marauder's Grenade Launcher, Gatling Gun, and BAT accessory - Gun Arm