Set in London during the 1970s, the Disney+ series, out May 31, is based on the autobiography, "Lonely Boy: Tales from a Sex Pistol," by guitarist Steve Jones. British director Boyle, whose filmography includes "Trainspotting" (1996), "The Beach" (2000) and "Slumdog Millionaire" (2008), prioritized authenticity -- going so far as to embed archival footage of the band in the show. There couldn't be a hair out of place -- literally. "We had to be exact," said Primorac in a video call ahead of the series release. "There are a lot of cuts where we go from the real thing into a cut with our footage."

Primorac banded together with the fashion department, which had been given access to original Vivienne Westwood pieces from the period, to create "a bible of every Sex Pistols concert." The book was an exhaustive catalog of each public appearance made by the band, providing invaluable information on which outfits were worn, how they were accessorized and, of course, what color their hair was.

Matching colors, hair length and proportion of spikes and styles proved to be the most difficult, Primorac said.

"Proportion is the hardest thing because you have to figure out what that [hair style] looks like on someone else," she said. "So many characters, like Sid Vicious, are incredibly well documented; on television, in print, everywhere. And it wasn't that long ago, people will remember. So it was hard."

The need for cosmetic precision plus Boyle's unorthodox directing method -- which saw the cast regularly perform two-hour long gigs as the Pistols at London's historic 100 Club -- meant cracking the look was a lengthy process for Primorac. "We recreated all the gigs there," she said. "And so you can't go in between takes and necessarily [alter] things because, you know, Danny wants to film it. So afterwards we'd go into a recording studio and watch the performance. That's when you can really see the proportion and how it all looks and where to make changes."