It is not a brand of clothes, it is a peace symbol, that is, an anti-nuclear war symbol. Many clothes have this logo on them. The peace sign became widely used in the United States after it was first used by friends of Martin Luther King during a civil rights movement. After that it spread.
Extended information:
The peace sign was designed by Gerald Holtom, a participant in the movement, at the request of Bertrand Russel, leader of the Movement for Nuclear Disarmament, as a protest against the 1958 nuclear bombing in Orl, England. Coat of arms of the action committee that established the "Atomic Weapons Development and Research Center" in the village of Demaston.
This symbol still serves as the British nuclear disarmament symbol. But around the world, people see it as a symbol of peace and non-violence. People can use this logo for free and without anyone's permission. This has led to its use and abuse.
The logo is also used for several other purposes such as business, advertising and fashion. "We can't prevent these uses, and we don't plan to apply for patents. All we can do is hope that those businesses will donate some money. Any money they donate, we will use it as CND's peaceful education and information work." So said a spokesperson for the Disarmament website.
Reference: Baidu Encyclopedia-Peace Sign