He went on to explain why he felt the costume was inappropriate and was told his message would be passed on to the dean.
"Especially with [my] family coming from Bosnia, we understand, you know, war victims and all that kind of stuff."
Liston College Board of Trustees chairman Ralph Elika said the student in question was sent home as soon as he was spotted wearing the outfit and was undergoing a "restorative justice" process through the school.
Elika described the incident as a "prank that backfired" and agreed the costume was "highly inappropriate" and offensive both to other students at the school and to members of the public who saw the costume in photos.
"It was a silly act that was intended to be a joke," he said. "The boy thought he was onto a winner but failed miserably."
Elika said the school had a strict policy around both uniform and costumes.
Last October, a Halloween costume of Holocaust victim Anne Frank ignited outrage and prompted several retailers to stop selling the item.
The costume featuring a green beret, a blue coat and a brown satchel was originally sold on a website.
Following a barrage of criticism online and from the Anne Frank Centre for Mutual Respect, the company concerned issued a statement apologising for any offence the costume has caused.