A teenage girl has been banned from her school in France after arriving in a long skirt that the headmistress decided appeared too religious.

The 16-year-old, who converted to Islam a year ago, arrived at her school outside of Paris on May 2 and, like each day, took off her veil.

However the skirt she was wearing that day, which reached below her knees and nearly to her shoes, was quickly spotted by the headmistress who allegedly decided it was too obviously religious, the Nouvel Obs reported.

A student is thought to have been turned away from the Flora Tristan school in Seine-et-Marne region of northern France after wearing a skirt deemed 'ostentatiously religious'

The day after, the student had a meeting with the headmistress in which she said she was told she could not come in to school in a long skirt, Islamophobie reported.

France passed a law in 2004 which applies to state schools and workplaces which bans the wearing of religious items such a veils, kippas and large Christian crosses.

Though 'discreet religious symbols' are allowed, the teenager's black H&M skirt was not viewed to be subtle enough.

According to Islamophobie, however, a long skirt alone is not enough to warrant a student being barred from a school on grounds of the 2004 law.

Her mother Marie-Christine de Sousa told the Nouvel Obs that her daughter was stopped by the headmaster who 'told her she was not allowed to enter [the school], but did not tell her why.'

She has been told she must find something else to wear before she returns to school.

Since her barring, the hashtag #JePorteMaJupeCommeJeVeux (i wear by skirt how i like) has since begun trending again after being created last year when a similar situation at a French school arose.

Wearing religious clothing and jewellery has been banned in France in state school and workplaces since 2004. Pictured are women protesting the controversial law when it was introduced

Her mother went into the Flora Tristan school in the Montereau-Fault-Yonne area of Seine-et-Marne area outside of Paris, to talk with the teachers, and the de Sousa family are now planning legal action.

'Yes, my daughter is French-Portugese, from a Catholic family and has converted to Islam. I always support her in her decisions and in what she chooses

'At the beginning of the year I allowed her to take the veil, which she removes each day before beginning class, however she wears long clothes to go to school,' Ms de Sousa told Nouvel Obs.

She added that her daughter was a law-abiding, respectful person and that people should stop 'judging so quickly.'