Revealed: How Prince William ensured he kept his cool on the big day... thanks to his tailor

• Prince's wedding outfit was made of special heat-absorbing material so he didn't faint at the Abbey

Prince William had his wedding uniform made of special heat-absorbing material, to prevent him passing out at Westminster Abbey.

And his brother Harry had a tiny Velcro compartment sewn into his wedding uniform to keep the ring safe.

Tailor Russell Kashket, who was responsible for making 2,000 royal wedding uniforms, has spoken for the first time since a confidentiality agreement lapsed after the nuptials.

Specially made: Prince William's wedding outfit was customised from a heat-absorbent material to prevent him passing out in the Abbey

More than 350 members of the Kashket military tailoring staff in north London made the outfits, which also included the drum majors' gold state coats, Household Cavalry Mounted Regiment dress, and uniforms for all five Footguards regiments.

'It was difficult to make it all without anyone knowing what it was for,' Mr Kashket said. "We had to use a pseudonym.'

Prince William met with Mr Kashket several times to discuss the design. 'He was very concerned about the heat because he knew all the cameras and lights would make it very hot in the Abbey,' Mr Kashket said.

'We worked together to get the look he wanted while using material to absorb the heat and make sure he didn't pass out in front of two billion people across the world.'

Hands-on approach: The Prince worked closely with the tailors to get the look he wanted for the wedding

'When we designed the outfits, we sat and had coffee and biscuits with Catherine and William. She was lovely and gave more input than people realise.

'We made the outfits from scratch. I was at the palace all the time. I was virtually living there - at one stage I was there every day of the week.'

The garments were made by hand by staff led by Mr Kashket's brother, director and tailor Marlon, using couture hand-stitch techniques to embroider gold wires into the collars and cuffs.

Prince William’s trousers were made of traditional tight-woven woollen Melton cloth, as used by military tailors since the 17^th century, but with special micropads - thin sponges designed to absorb sweat - sewn in to the lining. The sponges are more commonly used when making clothing for horse riders.

Marlon Kashket said: 'The prince has an excellent physique so he really did justice to our tailoring skill. We had a last-minute rush when the palace asked us if we could incorporate some device that would hold the ring.'

Ceremonial military garments such as these do not have pockets and there was concern that, if Prince Harry waved to the crowd on his way to the Abbey, then the ring might be lost.

Cunning: Prince Harry kept the ring in this secret compartment sewn into his wedding uniform

'To solve the problem we decided to sew a tiny secret compartment into the scarlet cuff sealed with Velcro. This kept Catherine's ring safe.'

Russell Kashket, his father, and their wives, attended Westminster Abbey for the wedding last Friday.

'It was only when I was sitting in the Abbey that I realised how I felt,' Russell Kashket said. 'He had chosen us. What an honour. It was unbelievable.

'I thought William looked great. I was very pleased to be part of the biggest day this country has seen for many years.'

Kashket and Partners were appointed official tailors for the big day. A royal warrant requested Kashket design and manufacture the Prince's colonel in the Irish Guards scarlet uniform, as well as the outfits worn by Prince Harry, the pageboys and 2,000 other military uniforms.

Smart: The wedding ring remained safe as Prince Harry - also in military uniform - walked Pippa Middleton up the aisle at Westminster Abbey

Chairman Russell Kashket had to sign a confidentiality agreement when he was first contacted by royal courtiers in February.

His family, who were originally from Poland and Russia where they supplied hats to Tsar Nicholas II, derived their name from the felt hats worn by Hasidic Jews.

The Kashkets moved to London in the 1920s when his grandfather, Alfred, one of the founding members of Loughton Synagogue in Essex, formed the UK company.

Mr Kashket, a member of Newbury Park Synagogue, said: 'I was called by Clarence House and told that Prince William had expressed an interest in us making the uniforms. I immediately went into work mode and knew we had to deliver - because the whole world would be watching.'

The company has designed outfits for the royal family for almost 20 years and produces items for royalty across the world, including eight kings.

After he was commissioned, Russell Kashket immediately called his father, 74-year-old Bernard, to ask for help in drawing up sketches.