This is an illustration for three Japanese kids characters.
They have found some weapons and armors on the battlefield and they imagine themselves as samurai or ashigaru (infantry).
– The girl (left) wears a haitate (guard to protect the thigh and knee) and a kote (armored sleeves)
– The kid (center) wears a kabuto (helmet) and a sode (shoulder guard)
– The boy (right) wears a jingasa (conical hat), suneate (shin guard) and hyourou (provisions)