Jodie Whittaker wanted her "Doctor Who" costume to use colour to express her character.
The 36-year-old star's first series as the new Time Lord kicks off next month, and the actress has worked with the team to create a symbolic outfit.
Appearing on BBC Radio 6 Music, she said: "For me, the most important thing was the use of colour. Different aspects of the blues to represent the sky.
"So, the inside lining of the coat is like space and the outside is like [daytime] sky. Things like that! I loved referencing the worlds that you're coming from into the costume, but then it needed to be comfortable.
"Often with heroic characters, I just think, "That looks really sweaty!" Do you know what I mean? "I bet it takes you like an hour to get in that?!" Whereas mine is really comfy, and comfy for anyone -- boy or girl. Shock, horror!"
The former "Broadchurch" actress admitted she relished having freedom to collaborate with designers on the clothes she'd be wearing, having not experience that with previous roles.
She explained: "It was really collaborative. More so than any other job," she explained. "Not because you don't get a say on anything else, but because if you're doing something that's 18th century, I'm not going to rock in and be like, "I've got this great idea! I wanna wear Converse".
"Like, I've got no knowledge [in that situation]. There's a certain mood, like with Beth Latimer [in "Broadchurch"], you have to look like you're from a certain place and a certain time. But the wonderful thing about The Doctor is that you don't have any of those rules."
Jodie's first series of "Doctor Who" launches on October 7 on BBC One with the episode "The Woman Who Fell to Earth".