French fashion groups Kering and LVMH will officially put an end to hiring unhealthy models after criticism that the industry encourages eating disorders.
Gucci, Yves St Laurent, Louis Vuitton and Dior are all part of the French conglomerate, and all agreed to sign a charter for “the well-being of models.”
Female models will now have to be a minimum French size 34 (a UK size six), and a French size 44 for men (a UK size extra small).
The companies have also agreed to not use men or women under the age of 16 to model adult clothing.
In addition, the charter pledged to make a dedicated psychologist or therapist available whilst the models are at work.
The BBC have also reported that models will now have to present a valid medical certificate to prove that they are fit for work.
“We have the responsibility of building new standards for fashion and we hope to be followed by other players in our sector,” said Antoine Arnault, an LVMH director.
She continued: “I am deeply committed to ensuring that the working relationship between LVMH Group brands, agencies and models goes beyond simply complying with the legal requirements.”
The poor treatment of fashion models has become a controversial topic in recent years.
In March, Balenciaga sacked two casting directors after they were reported to have left 150 models waiting for hours in a dark stairwell while the they went to lunch.
Their actions were described as “sadistic” and “cruel” by casting director James Scully, who revealed the treatment the models had faced.
In France, a law banning skinny models came into effect in May.
Companies could be fined up to 75,000 euros (£69,000) or its bosses jailed for up to six months if they break the law.
LVMH’s chairman said the companies wanted to make “a real difference in the working conditions of fashion models”.
“Respecting the dignity of all women has always been both a personal commitment for me and a priority for Kering as a group,” the group’s chairman added.
The companies’ changes will come into effect before Paris Fashion Week this month.