Despite five years with the predominantly white livery of former title sponsor Martini, Williams is still associated with the dark shade of blue it carried during its dominant years of the 1990s.
Ex-F1 driver-turned-pundit Martin Brundle claimed last month that Williams was left in a "void" by the growth of other teams' partnerships, but Williams has said before that she needs to "protect our independence" instead of pursuing different relationships.
Williams said the new look is "fresh" and "bright", and hopes the performance will get a major lift in 2019 as well.
The British team slumped to last in the constructors' championship in 2018 after a revival from 2014-2017 in which it finished in the top five each year and scored 15 podiums.
When asked whether her father, team founder Sir Frank, was a fan of the change, she said: "Frank loved it - you might be surprised to hear that, but he did".
The partnership was revealed during a special event held at Williams Racing HQ ahead of the 2019 season and signals an exciting new era for the team.
"I was a little nervous presenting it to him but he is fully behind it".
"Frank is very traditional and protective of the traditional navy blue and white, but also understanding of the arguments behind the change". A Formula 1 auto at the end of the day is your shop window to the world and I wanted to tell a great story and come out with a really vibrant livery.
"We spent a lot of time on this livery".
"A Formula One vehicle is your shop window to the world so I wanted to make sure we came out with a really bright livery".
"I am still here, and if he didn't like it, he would have fired me." she added.
Collaborations between F1 teams remain a key concern ahead of the 2021 overhaul planned by F1 owner Liberty Media, because there are concerns manufacturers will user smaller outfits to help get around future budget cap restrictions.