Through her brand, Atelier TAMMAM, founded in 2007, she creates bespoke, high-end garments and accessories that prioritize environmental and social responsibility, with ethical production methods.
A vegetarian from childhood, Tammam was inspired by the British eco-warrior, Swampy, to join public protests and support human and animal rights.
The project began with "One Dress: WOMEN," a collaborative couture gown embroidered with words symbolizing feminism and strength, contributed by individuals worldwide.
[9] "One Dress: PLANET", which launched on 15 February 2025 at the Royal Geographical Society, merges haute couture with environmental activism in partnership with Stop Ecocide International.
[10][11] Tammam has collaborated with the University of Reading to create an eco-friendly fashion line inspired by Professor Ed Hawkins' "warming stripes" graphic, which illustrates the rise in global temperatures since 1850.
This collection, showcased at London Fashion Week in September 2021, featured garments made from sustainable materials such as hand-loomed organic cottons, peace silks, and repurposed vintage fabrics.