France's parliament on Thursday began debating a bill targeting workplace discrimination based on hair texture which the draft law's backers say targets mostly black women wearing their hair naturally.

Olivier Serva, an independent National Assembly deputy for the French overseas territory of Guadeloupe and the bill's sponsor, said it would penalise any workplace discrimination based on "hair style, colour, length or texture".

Similar laws exist in around 20 US states which have identified hair discrimination as an expression of racism.

In Britain, the Equality and Human Rights Commission has issued guidelines against hair discrimination in schools.

Serva, who is black, said women "of African descent" were often encouraged before job interviews to change their style of hair.

- 'Target of discrimination' -

The deputy, who also included discrimination suffered by blondes and redheads in his proposal, points to an American study stating that a quarter of black women polled said they had been ruled out for jobs because of how they wore their hair at the job interview.

Such statistics are hard to come by in France, which bans the compilation of personal data that mention a person's race or ethnic background on the basis of the French Republic's "universalist" principles.

The draft law does not, in fact, contain the term "racism", noted Daphne Bedinade, a social anthropologist, saying the omission was problematic.

"To make this only about hair discrimination is to mask the problems of people whose hair makes them a target of discrimination, mostly black women," she told Le Monde daily.

While statistics are difficult to come by, high-profile people have faced online harassment because of their hairstyle.

In the political sphere they include former government spokeswoman Sibeth Ndiaye, and Audrey Pulvar, a deputy mayor of Paris, whose afro look has attracted much negative comment online.

The bill's critics say it is unnecessary, as discrimination based on looks is already banned by law.

"There is no legal void here," said Eric Rocheblave, a lawyer specialising in labour law.

Calling any future law "symbolic", Rocheblave said it would not be of much practical help when it came to proving discrimination in court.

Kenza Bel Kenadil, an influencer and self-proclaimed "activist against hair discrimination", said a law would still send an important message.

"It would tell everybody that the law protects you in every way and lets you style your hair any way you want," she said.

The influencer, who has 256,000 followers on Instagram, said she herself had been "forced" to tie her hair in a bun when she was working as a receptionist.

Her employers were "very clear", she said. "It was, either you go home and fix your hair or you don't come here to work".