An Essex firm is making stab-proof hoodies lined with Kevlar, the material used in body armour for British troops.
Romford-based Bladerunner, which makes protective clothes for police forces and security guards, is selling the tops for £65.
Boss Adrian Davis claims to be in discussion with schools in east London about putting Kevlar linings into school uniforms.
"It's all in development but we're at an advanced stage," he said.
"We've sent examples of school jumpers to the manufacturers and we're waiting for the costings. I really believe it's needed," he told The Sun.
His colleague Barry Samms says a policeman friend has come across 14 and 15-year-olds wearing stab-proof vests for protection on the streets.