Zac Posen's uniform designs for Delta Air Lines have been rejected for not being "practical".

Zac Posen

Zac Posen

The 35-year-old fashion designer landed a contract with the air line in April last year, and is set to design the work-wear for the flight attendants, ground staff and support crew at the company, however the creative mastermind has been forced to re-design the garments because the outfits are deemed too "restrictive" and "sexy" for the crew to wear for work.

Speaking about the attire, a source told the New York Post: "They are stuck in the design stage because his designs are not deemed to be practical for the flight attendants. The attendants need to be comfortable and wear the uniforms for long periods of time. His designs look great, even sexy, but are restrictive and don't work for all sizes and ages.

"Zac has submitted multiple designs and, while they are gorgeous, they are not entirely practical."

And the entrepreneur - who recently designed Clare Danes' spectacular masterpiece for the Met Gala in May this year, which glowed in the dark - has to have his creations kept under "tight security" to ensure the ensemble is exclusive to the air line and not leaked to any rival companies, which is a "complicated operation" for the staff.

The source explained: "The last piece he [Zac] submitted had up to 20 seams in it. There's frustration on both sides. All the designs have to be kept under tight security, as they cannot fall into the wrong hands. It is turning into a complicated operation."

And Zac - who is expected to produce 50 ensembles for Delta Air Lines - has to perfect the uniform within two years for its big unveil in 2018.

A spokeswoman from the airline said: "We will be debuting the uniforms to all of Delta's 80,000 employees this fall. The wear-testing process, which includes approximately 1,000 employees from around the globe, will run from late 2016 into early 2017. Then, we will review wear-tester feedback and work with Zac and his team to make any necessary adjustments so that we can begin production. We plan to have all of our ... employees in the uniform in 2018."

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