In Once Upon A Time In Hollywood (2019), Margot Robbie actually wore some of Sharon Tate's personal jewellery. (Sources/more info in the comments). : r/MovieDetails
First Look at Margot Robbie as Sharon Tate in Tarantino's Next Movie
See Margot Robbie as Sharon Tate in 'Once Upon a Time in Hollywood' Poster – The Hollywood Reporter
Margot Robbie Wears Sharon Tate's Jewelry in Once Upon a Time in Hollywood
Quentin Tarantino's Manson Movie: Margot Robbie is Sharon Tate | IndieWire
Once Upon a Time in Hollywood: Sharon Tate's sister wept at Margot Robbie portrayal | EW.com