On Sunday (06Dec15) the British star posted a photograph of herself wearing a top emblazoned with the slogan 'The Future Is Female' on her Instagram.com account, alongside a link to an online retailer selling the items to raise funds for the United Nations' Girl Up charity.

The slogan previously appeared on a T-shirt worn by folk musician Alix Dobkin in a photograph published in 1975, but was reproduced with permission and incorporated into a new design by Los Angeles-based retailer Otherwild earlier this year (15).

A designer for Otherwild, Rachel Berks, claims the sweater Delevingne is promoting infringes upon her company's intellectual property rights because it is similar to their version, which is sold in aid of women's charity Planned Parenthood (PP).

"Otherwild's redesign and reissue of the FIF (Future Is Female) tees and buttons is protected under (U.S.) copyright law, which mandates that any reproduction of an existing known public work must be altered at least 20 (per cent) from the original," Berks wrote in a post on the company's Instagram page.

"If model/actress Cara Delevingne wanted to sell my line, she would need to wholesale them from Otherwild, and because we donate 25 (per cent) of our line's proceeds to Planned Parenthood, Delevingne's ethical practice would benefit not only our woman-owned small business but would also serve as a significant donation to PP... Delevingne's choice to lift and manufacture Otherwild's design, claiming it as her own to sell with an undisclosed charitable offering, is indefensible. Her actions ironically counter the very message of the slogan 'The Future Is Female'..."

The Paper Towns actress has since placed an acknowledgement to Otherwild in her Instagram post, but the edit has failed to placate the designer.

She adds, "Although under pressure, Delevingne has changed the line's attribution several times in the past 24 hrs., she has not yet offered to wholesale from us nor cease and desist blatantly copying and selling our designs."

As went WENN went to press, representatives for Delevingne had yet to respond to requests for comment and the item was still on sale.