Tai Mei Elementary School in Tokyo's wealthy Ginza district brought in professional guards this week after at least three of its pupils encountered abusive strangers who pulled their uniforms or asked if they were students of the school, a local district spokeswoman said.
Japan boasts extremely safe streets, and guards are rarely seen at school grounds.
“Security guards are patrolling area streets that pupils use in the morning and when they go home," the spokeswoman said on condition of anonymity.
"This is about student safety."
The school has faced a storm of public and online criticism over its decision to adopt the designer uniforms from April, with a full set costing parents around B23,789 (¥80,000).
While the school says the new uniforms are not mandatory, critics said parents would feel compelled to buy them to ensure their children were not left out.
Since the decision caught media attention earlier this year, at least one pupil was confronted by an adult who pulled the child's uniform, asking, “Is this Armani?”, the spokeswoman said.
In two other cases, strangers asked pupils if they were from the school, she added.
The school administration reportedly said the outfits were a bid to tie the 150-year-old school to the up-scale Ginza district where it is located.
The uniform features sharply tailored blazers as well as add-ons like bags that can push the total set's cost to around B26,763 (¥90,000), a price critics said was too expensive for uniforms for fast-growing children.