Italian fashion designer Roberto Cavalli has been accused of hijacking a symbol used by a school of Sufism to promote his Just Cavalli perfume.
The group Sufi Rights said on its website that it was working with the students to highlight the "offence Roberto Cavalli ... has caused by using their emblem". Sufism is a branch of Islam.
The group's comments follow a social media campaign by the students, with the Twitter hashtag #TakeOffJustLogo.
Sufi Rights describes its objective as providing a voice to Sufis by "protecting the sanctity of their faith" and raising awareness about its misrepresentation.
According to the organisation, the designer has rotated the symbol of the MTO Shahmaghsoudi School of Islamic Sufism - two arcs linked in the middle - by 90 degrees to come up with the one used on his perfume.
The school, which grew out of the Iranian diaspora, has branches in several countries.
The symbol had been "long used by Sufis", said Farid Benaissa, one of the movement's organisers.
Several protests have already taken place outside Roberto Cavalli shops in Dallas, Los Angeles, New York, Washington, Dusseldorf and London. Others are planned, including in Paris.
"They [the students] are demanding the withdrawal of all products using their symbol," said Sufi Rights, adding that the demand was based on a refusal to see the "sacred character of their faith sullied".
The Roberto Cavalli fashion house said it did "not wish to say anything on the subject".