Rosie Budhani has been responsible for building the ethical clothing chain's brand name within the mainstream and ethical fashion industries. The brand won an Observer Ethical Award last year for best ethical fashion product.
Budhani will join Bray Leino's London office in May reporting to director Penny Brignell.
The agency's new fashion offering will complement its existing ethical and environmental division which is headed up by associate director Alison Weir and which counts Ecover, Innocent Village Fete and Ethicalsuperstore.com as clients.
Prior to Terra Plana, Budhani worked at Exposure Promotions on brands including Thomas Burberry, Dockers and Aldo.