Julia Fox Dresses as Blood-Soaked Jackie Kennedy for Halloween Party

10:35 AM PT -- Julia Fox just addressed her reasoning behind her choice of controversial Halloween outfit this year, posting a statement on IG …

"I’m dressed as Jackie Kennedy in the pink suit. Not as a costume, but as a statement. When her husband was assassinated, she refused to change out of her blood-stained clothes, saying, ‘I want them to see what they’ve done.’ The image of the delicate pink suit splattered with blood is one of the most haunting juxtapositions in modern history. Beauty and horror. Poise and devastation.

"Her decision not to change clothes, even after being encouraged to, was an act of extraordinary bravery. It was performance, protest, and mourning all at once. A woman weaponizing image and grace to expose brutality. It’s about trauma, power, and how femininity itself is a form of resistance. Long live Jackie O ♥️"

Julia Fox looked back to the John F. Kennedy assassination for inspiration for her Halloween costume ... dressing up as Jackie Kennedy in her blood-soaked pink suit.

Ya gotta see Julia's costume from The Cursed Amulet's Halloween party in New York City Thursday night ... she channeled the way JFK's widow looked in 1963 after the president's head got blown off in Dallas, Texas.

Jackie was wearing a pink Chanel suit and a pink pillbox hat as she sat next to JFK in a motorcade driving through the city ... and her outfit was sprayed with blood when her husband was assassinated. She held him in her arms as he died.

Jackie was still wearing the blood-stained outfit when JFK's veep, Lyndon B. Johnson, was sworn in as she stood at his side ... and the suit is now at the National Archives, bloodstains and all.

Julia didn't skimp on the blood for her costume ... she's got red stains all over her jacket, skirt and stockings.

In an interview with Vulture, Julia described her costume as "Jackie O-Nasty" -- a play on Jacqueline Onassis, the last name Jackie took when she remarried years later -- and said she was "serving bloody diva, single mom who's about to cash that check."

Julia's catching a lot of flak online for the costume choice ... but it's getting a lot of attention. 🤷🏽‍♂️