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A women’s rights charity in England is investigating claims that T-shirts featured in its current campaign are being made by women in a sweatshop in Mauritius.

The shirts - emblazoned with the slogan ‘This Is What A Feminist Looks Like’ – made headlines in the U.K. last week after several British politicians wore them during a photo shoot for Elle magazine.

Love that you tweeted benedict and not your own pic! “@EmWatson: pic.twitter.com/JpwRYh2bgi” — ELLEUK (@ELLEUK) October 30, 2014

On its site, the Mail on Sunday said its investigation had found the T-shirts “were being produced on a factory on the Indian Ocean island of Mauritius where the women machinists sleep 16 to a room” and were being made “by women workers being paid just 62p (a little over one Canadian dollar) an hour.”

The campaign is the brainchild of the Fawcett Society, which calls itself the U.K.’s leading charity for women’s equality and rights.

After the 'This Is What A Feminist Looks Like' sweatshirt? We have good news for you http://t.co/HTdC8xYkFMpic.twitter.com/ZjfJfbk2PI — ELLEUK (@ELLEUK) October 30, 2014

“We have been very disappointed to hear the allegations that conditions in the Mauritius factory may not adhere to the ethical standards that we, as the Fawcett Society, would require of any product that bears our name,” the organization’s deputy CEO Eva Neitzert wrote on Fawcett’s site Saturday.

“At this stage, we require evidence to back up the claims being made by a journalist at the Mail on Sunday,” she said. “However, as a charity that campaigns on issues of women’s economic equality, we take these allegations extremely seriously and will do our utmost to investigate them.”