Question: Who directed the film which used the costume designs of Sandy Powell?

Context paragraphs:
The Young Victoria: The Young Victoria is a 2009 British-American period drama film directed by Jean-Marc Vallée and written by Julian Fellowes, based on the early life and reign of Queen Victoria, and her marriage to Prince Albert of Saxe-Coburg and Gotha.  Produced by Graham King, Martin Scorsese, Sarah Ferguson and Timothy Headington, the film stars Emily Blunt, Rupert Friend, Paul Bettany, Miranda Richardson, Mark Strong and Jim Broadbent among a large ensemble cast.

Skip Mercier: G.W. (Skip) Mercier is an American costume, puppet, and set designer.  He has designed for over 370 productions of theater, musical theater, opera, dance, film, and television.  He is best known for his set and costume designs for "Juan Darien: A Carnival Mass" in which he received a Tony Award Nomination for Scenery and two Drama Desk Nominations for Scenic Design and Costume Designin 1997.

Velvet Goldmine: Velvet Goldmine is a 1998 British-American drama film directed and co-written by Todd Haynes set in Britain during the glam rock days of the early 1970s; it tells the story of the fictional pop star Brian Slade.  Sandy Powell received a BAFTA Award for Best Costume Design and was nominated for an Academy Award for Best Costume Design.  The film utilizes a non-linear structure to interweave the vignettes of the various characters.

The Red Shoes (ballet): The Red Shoes is a ballet choreographed by Matthew Bourne using the music of Bernard Herrmann (1911–1975).  It is based broadly on the 1948 film "The Red Shoes" by Michael Powell and Emeric Pressburger.  The set and costume designs are by Lez Brotherston.  The ballet was premiered on 6 December 2016 at Sadler's Wells Theatre, London, by Bourne's ballet company, New Adventures.

Costume Designers Guild Awards 2015: The 18th Costume Designers Guild Awards, honouring the best costume designs in film and television for 2015, were given in 2016.  The nominees were announced on January 7, 2016.

Costume Designers Guild Awards 2004: The 7th Costume Designers Guild Awards, given on 19 February 2005, honored the best costume designs in film and television for 2004.  Winners highlighted in bold.

Sandy Powell (costume designer): Sandy Powell OBE (born 7 April 1960) is a British costume designer.  She has won three Academy Awards for Best Costume Design for "Shakespeare in Love" (1998), "The Aviator" (2004), and "The Young Victoria" (2009), and has been nominated 12 times for the award.  She has also received 13 BAFTA Award nominations, winning for "Velvet Goldmine" and "The Young Victoria".  She won many other awards in costume design for the latter film.  Powell is often associated with Martin Scorsese and Todd Haynes, having designed the costumes for six of Scorsese's films and four of Haynes'.

Costume Designers Guild Awards 2008: The 11th Costume Designers Guild Awards, honouring the best costume designs in film and television for 2008, will be given on February 17, 2009.  The nominees were announced on January 13, 2009.

Costume Designers Guild Awards 2016: The 19th Costume Designers Guild Awards, honoring the best costume designs in film and television for 2016, took place on February 21, 2017.  The nominees were announced on January 12, 2017.

Costume Designers Guild Awards 2005: The 8th Costume Designers Guild Awards, given on February 26, 2006, honored the best costume designs in film and television for 2005.  Winners highlighted in bold.

Supporting paragraphs: Sandy Powell (costume designer) The Young Victoria
Answer: Jean-Marc Vallée