He also sometimes wears a blue backpack that has the same sideways medical cross as his hat. Chopper's left antler is braced at base by a metal plate because it was broken du his search for the Amiudake when he was young He usually wears a large pale red/pink fuzzy top hat with a sideways medical cross (given to him Hiluluk) and a maroon pair of shorts.
Most of the time, Chopper is a toddler-sized human/reindeer hybrid, but his Devil Fruit abilit allow him to change his appearance depending the situation.
