Simpson Grierson partner Earl Gray, who acted for Guru Denim, believed the case was the first major criminal prosecution for counterfeit clothing in New Zealand.
Guru Denim was concerned the poor quality of the fake jeans could harm True Religion's reputation, he said.
"They're very much high-end in fashion and that's why the product they [the offenders] were selling, although they weren't selling them really cheaply, really damages the image of the brand," Gray said.
"It's very hard to estimate [damages] because the offenders never let us know how many jeans they sold," he said. "It was potentially over $100,000 or $200,000 in terms of the lost profit and damage to goodwill from this sort of activity."
The real jeans sell for up to US$430.