A mum has hit out at Brentford School for Girls for flouting government guidelines on uniform sales.
The school, in Boston Manor Road, makes parents buy pupils' skirts and shirts on site, despite guidelines issued last year saying uniforms must be reasonably priced and widely available.
One mum, who only wished to be identified as Miss Banks, said: "The fact the school is the only place to buy the uniform gives us no choice and puts parents with a low income, such as myself, under a lot of financial strain.
"They are selling the pink school shirts for £11 each, whereas I could buy a pack of three white ones from Primark for £3 and dye them myself."
Although the guidelines were issued last year to help parents on low incomes, many schools are ignoring the advice.
A poll by YouGov revealed that of 2,128 parents asked, 73 per cent found the expense of school uniforms was a source of stress.
Brentford School for Girls head teacher Julie Tomkins said: "We have been in discussion with the local authority and are aware of the guidelines.
"We have been trying to source cheaper suppliers for the shirts. However, they all come out more expensive than we currently sell them for, although we are still looking into it.
"I have no problem if any parents want to dye their own shirts, as long as they are the correct shade of pink. I'm aware that pink shirts are harder to find on the high street.
"However, it was the students and parents themselves who voted to have the pink at the beginning of the last school year, as they felt it was distinctive."
Delroy Pomell, director for education at children's charity Barnardo's, said: "Youngsters and families living in poverty face numerous challenges, including poor housing, poor health and poor nutrition.
"Starting the first day of school with the right uniform, school books, bag and shoes shouldn't become yet another source of stress."