Zac Posen has been on 40 planes since January 1, laying the groundwork for the imminent launch of his Delta uniforms. It’s a project with global scale. He’s designed kits for upwards of 60,000 of the airline’s employees, from flight attendants to the ground crew and all posts in between. Everything had to be stress tested, and as for sizing, it’s a whole lot more complicated than the department store standard 0 to 12.