Pharrell Williams feels he must be respectful of the fashion industry.

The ‘Happy’ hitmaker has collaborated with Moynat designer Ramesh Nair – who previously worked for luxury brand Hermes – to create a series of pochettes and handbags decorated with steam trains and, although this is far from his first delve into the fashion world, he is still reluctant to refer to it as a job.

Quizzed on whether fashion had become his second string career after music he said: “I would be scared to say anything beyond that while I am enjoying these opportunities.

“I have to be incredibly respectful of the expertise and talent of the people I have been lucky enough to work with. And I intend to continue being respectful of that.”

The 40-year-old star – who has also worked with Comme des Garcons, Adidas and Uniqlo – admits, however, that there are many similarities between producing music and creating a piece of fashion.

He told the Daily Telegraph newspaper: “Well, they are very different – but yes, there are similarities too. You have seven musical notes and you have seven different colours. You have different genres of music, and different types and styles in fashion.”