Roland Mouret loved working alongside Britain's Duchess Catherine to create her raciest dress so far.

The French fashion designer believes he did "quite well" to come up with the brunette royal's most daring gown to date, a full-length cream evening dress featuring a front split, which she wore to a dinner at luxury hotel Claridge's in London's Mayfair last month.

"I think it was quite fantastic that there was a split up the front. That picture of a woman when you catch a little of the leg, that's what you want to see. It's that notion of privacy. It's something that should be for her husband and she just shows a glimpse of it and I think that is one of the more amazing moments of life. You feel happy when you see that. It was not too much. It was with a lot of respect. Yes, I think I did... quite well."

Roland - who has previously worked with Victoria Beckham - found the duchess to be "fantastic" to collaborate with and he was honored to be able to design clothes for a member of Britain's royal family.

"She's a fantastic person to work with. She's a woman of her time. She's very aware of her position and she's a really nice person. She's human. It's really nice to work with someone in her position. It's... historic, yes," he added to The Daily Telegraph.