A school is planning to ban its female students from wearing skirts – because they make male teachers feel uncomfortable.
The secondary school also intends to force all students to stick to approved trousers bearing the logo to stop girls arriving in skinny tight-fitting styles.
And if pupils fail to stick to the strict new rules they will be put into an isolation room.
But the plan has sparked outrage among parents who have backed a petition that has already garnered 1,000 names.
Bridlington School in Hull, East Riding, currently spends £25,000 a year on staffing the isolation room.
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Headteacher Sarah Pashley has told parents pupils will be expected to wear trousers from designated suppliers, to stop pupils "pushing the boundaries" by wearing skinny tight-fitting trousers.
Despite many parents being furious about the move, they do not want to be named in case the school excludes them from a meeting on the issue next week.
One said: "My daughter alternates between wearing a skirt and trousers.
"She wears her skirt to her knees. I think it's unfair to punish all girls by banning skirts because a small number wear theirs too short.
"Apparently, male teachers feel uncomfortable telling the girls if their skirts are too short."
The mum-of-three insisted girls should be allowed a choice of a skirt or trousers.
Another parent claimed staff do not set a good example.
She said: "Some female staff wear high heels, short skirts and low-cut blouses.
"Are they going to be wearing trousers?"
An online protest petition, which says the parents of Bridlington School children should have the right to buy school trousers or skirts without logos from whichever retailer they see fit, has attracted more than 1,000 signatures and 200 comments.
Petitioners have branded the move, planned for September, as "ludicrous", "ridiculous" and "disgusting".
Some parents claim preventing female pupils wearing skirts is a breach of human rights, but this is denied by the school.
Ms Pashley said: "We have a very simple school uniform, which we enforce strictly."
She claimed embarrassment for male staff caused by girls wearing short skirts was not the main reason for the change.
She said: "To set it in context, on one occasion when a male member of staff challenged a female student on her skirt length, she retorted, 'You shouldn't be looking at my legs'.
"The male member of staff was understandably uncomfortable with this and reported it to me immediately.
"Male pastoral staff asked me to share this incident with the governing body when uniform was reviewed."
Ms Pashley said the school's governors decided on the uniform change and a letter has been sent to parents, who have been invited to talks on Tuesday.
Trousers are also an issue at the school.
Ms Pashley told parents in her letter: "Trousers are a constant problem because of ever-changing fashions and some students pushing the boundaries in terms of purchasing 'skinny', tight-fitting trousers from non-uniform suppliers.
"This causes confrontation between staff and students and also between the school and some parents/carers, who feel that the trousers they have bought do conform to the school uniform policy.
"If trousers also have to be purchased from a school uniform supplier and have a logo on them, then this problem will no longer exist."
Many parents are concerned about the increased cost of buying a uniform from designated suppliers.
But the school insists it would give help to parents from the £25,000 it projects to save from no longer needing staff the isolation room.