Thanks to mcrudd finding out which hair was used as base, I can help you out with the rest. However, as I can't post links, you'll need to do a little googling ;)
If you go to Youtube and type in "EnglishSimmer Create A Sim LGBTQ+ Pride" you'll see the video where she creates the sim. In the description below she has posted a link to the blog(?) of the creator, however, the tumblr account no longer exists. But since the link also mentions the name of the creator, you can google "Peasims Movie Hangout Hair" and hopefully see a list of sites that mention the hair. The first one that pops up, when I do the search, is bumblebee lover (goldrumz)'s tumblr and that one has the link to mediafire where you can download the hair :)
On a sidenote, when I looked for recolours of the Movie Hangout hair, I came across one done in ombres by Meisiu which I first thought was the one you were looking for, but it looks kinda cool too in case you want even more options :)