'I was bought from my parents' village in [the northern state of] Bihar and taken to New Delhi by train,' he says. 'The men came looking for us in July. They had loudspeakers in the back of a car and told my parents that, if they sent me to work in the city, they won't have to work in the farms. My father was paid a fee for me and I was brought down with 40 other children. The journey took 30 hours and we weren't fed. I've been told I have to work off the fee the owner paid for me so I can go home, but I am working for free. I am a shaagird [a pupil]. The supervisor has told me because I am learning I don't get paid. It has been like this for four months.'
The derelict industrial unit in which Amitosh and half a dozen other children are working is smeared in filth, the corridors flowing with excrement from a flooded toilet.
Behind the youngsters huge piles of garments labelled Gap - complete with serial numbers for a new line that Gap concedes it has ordered for sale later in the year - lie completed in polythene sacks, with official packaging labels, all for export to Europe and the United States in time for Christmas...
In recent years Gap has made efforts to rebrand itself as a leader in ethical and socially responsible manufacturing, after previously being criticised for practices including the use of child labour.
With annual revenues of more than £8bn and endorsements from Madonna and Sex and The City star Sarah Jessica Parker, Gap has arguably become the most successful brand in high-street fashion. The latest face of the firm's advertising is the singer Joss Stone.
Founded in San Francisco in 1969 by Donald Fisher, now one of America's wealthiest businessmen, Gap operates more than 3,000 stores and franchises across the world. In Britain Gap, babyGap and GapKids are very successful, their own-brand jeans alone outselling their retail rivals' lines by three to one.
Last year, the company embarked on a huge advertising campaign surrounding 'Product Red', a charitable trust for Africa founded by the U2 singer Bono and backed by celebrities including Hollywood star Don Cheadle, singers Lenny Kravitz and Mary J Blige, Steven Spielberg and Penelope Cruz. As part of the fundraising endeavour, Gap launched a new, limited collection of clothing and accessories for men and women with Product Red branding, the profits from which are being channelled towards fighting Aids in the Third World.
On its website the company states that all individuals who work in garment factories deserve to be treated with dignity and are entitled to safe and fair working conditions and not since 2000, when a BBC Panorama investigation exposed the firm's working practices in Cambodia, have children been associated with the production of their brand.
Gap has huge contracts in India, which boasts one of the world's fastest-growing economies. But over the past decade, India has also become the world capital for child labour. According to the UN, child labour contributes an estimated 20 per cent of India's gross national product with 55 million children aged from five to 14 employed across the business and domestic sectors.
...'This may not be what they want to hear as they pull off fresh clothes from clean racks in stores but shoppers in the West should be thinking "Why am I only paying £30 for a hand-embroidered top. Who made it for such little cost? Is this top stained with a child's sweat?" That's what they need to ask themselves.' [saysBhuwan Ribhu, a Delhi lawyer and activist for the Global March Against Child Labour]