Lacoste, the French fashion label known by its green crocodile logo, is reported to have asked the authorities in Norway to prevent Anders Behring Breivik from wearing the brand.
The rightwing extremist, who has admitted killing 77 people during bomb and gun attacks in July, has been pictured wearing Lacoste items since he was arrested.
Norway's Dagbladet newspaper reported that police prosecutor Christian Hatlo has confirmed that Lacoste contacted the police with the request
"Yes, we have been contacted by Lacoste, but what they have asked remains between us," he was quoted as saying.
Breivik was pictured wearing a red Lacoste jumper as he left a courthouse in Oslo on 25 July, and he has been seen wearing a black Lacoste sweater on at least one other occasion.
The mass killer, whose request for an open hearing and the opportunity to wear a uniform was denied, referred to Lacoste on a number of occasions in a rambling "manifesto" that emerged after the attacks.
In one section, he advised would-be followers to wear "Lacoste etc, conservative colours" in order not to arouse suspicion.
At another point, referring to his solitary existence while preparing for the attacks, he wrote of the "mostly unrefined/un-cultivated [sic]" people in the area where he was living.
"I wear mostly the best pieces from my former life, which consists of very expensive brand clothing, LaCoste [sic] sweaters,piques etc. People can see from a mile away that I'm not from around here."
The reported intervention by Lacoste comes after the US fashion brand, Abercrombie & Fitch, offered to pay a reality television star not to wear its clothes earlier this year.
The company offered a "substantial" sum to Michael Sorrentino – AKA The Situation from MTV's Jersey Shore – not to wear its clothes after it decded that the show's cocktail of sex, alcohol, bragging and bad behaviour is harming its "aspirational" brand image and "may be distressing to many of our fans".