From StarWars.com:
“[…] Now, veteran writers Ryder Windham and Adam Bray take us all-troopers all-the-time with Stormtroopers: Beyond the Armor.
Released last October, this in-depth guide, produced by becker&mayer! and published by Harper Design, traces the real world history of each iteration of stormtrooper and clone trooper (and many of their related military personnel and equipment) from concept to filming costume to in-universe background and beyond. […]
StarWars.com: By documenting the total story of troopers as a story element in the saga, and as an icon of Star Wars in our world, you also are giving a history of Star Wars moviemaking, merchandising, and cultural impact, from the original trilogy through the prequels, TV series, and into the Disney era with the sequels and standalones. What in this overall history really stands out for you? What cool tidbits of information really amazed you?
Adam Bray: I was surprised how much influence Hasbro has had on recent Star Wars animation, from initiating Tartakovsky’s Clone Wars series, to the classic Kenner action figures as inspiration for the character designs in Star Wars Rebels. I was also fascinated how George Lucas’ ideas about who stormtroopers were actually changed over time. It wasn’t until he began conceptualizing a Star Wars TV show that Lucas decided the stormtroopers would be normal humans rather than clones.
George Lucas’ artistic choices about how to portray the militaries of the Republic and Empire were also fascinating. The diversity in personalities within the clone army versus the uniformity of troopers and officers within the Empire (despite no longer being clones) is quite a contrast. The Republic valued diversity, and so the clones were allowed freedom of personal expression. The Empire, on the other hand, was a repressive regime that demanded order through conformity, or sameness. […]”
Reminder from Wookieepedia:
“Star Wars: Underworld is the working title of a proposed live-action television series that would be set during the timespan between the films Star Wars: Episode III Revenge of the Sith and Star Wars: Episode IV A New Hope. George Lucas first announced the series at 2005’s Celebration III. Over the next few years, a variety of writers were hired, over fifty scripts were written and art designers worked on visualizing Lucas’ ideas. However, in 2010, Lucas announced that the series was on hold due to budget constraints. […]”
Naboo News 
Well that contradicts with what Lucas said for AOTC. He claimed he had Jango bump his head to show where stormtroopers got that trait from. He even had the clones in TCW bump their heads to further cement the Jango stromtrooper connection. Lucas also said his original backstory for Boba Fett was that he was the son of a clone stormtrooper.
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