In regards to underweight models, it was just this May that Louis Vuitton came under fire for booting a model from its show who was just a size 2, so these guidelines come at a particularly poignant time.
To begin with, female models, who are smaller than French size 34 - nearly equivalent to U.S. size 0 - and male models below French size 44 can not be featured on fashion shows or campaigns.
The brands have also agreed they will no longer use catwalk icons who are younger than 16 year old to exhibit their adult ranges.
All models will also have access to a dedicated mental health professional during working hours. This includes models having to present a medical slip from a doctor saying that they are in good health.
Both fashion houses said they had been prompted to act out of concern for models' wellbeing.
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The charter, which starts just in time for the spring 2018 show season that kicks off today with New York Fashion Week, applies to all of their brands and "goes one step further" to pay "particular attention to ensuring good working conditions"; indeed, the stringent guidelines they've released seem nearly too good to be true. Fashion agencies face fines of up to €75,000 (S$120,000) or imprisonment of up to six months if they breach the law.
It's the first time these two powerful corporations have come together to achieve a common goal-and, given their sway over so many influential brands, this might be the most concrete step toward a healthier (and, hopefully, more inclusive) industry we've seen in recent memory. Gucci, Christian Dior, Stella McCartney, Marc Jacobs and Balenciaga are among a long list of brands owned by the pair.
François-Henri Pinault, son of Kering owner, François Pinault, added: "We wanted to move quickly and hit hard so that things really change".
Antoine Arnault, a board member of LVMH, said to AFP: "As the leader in the luxury sector, we believe it is our role to be at the forefront of this initiative".
As a hugely powerful industry the fashion world has a duty of care both to the models it employs and the wider world informed by the imagery we produce.