Sashaying into the Vanity Fair Oscars party at the Wallis Annenberg Center for the Performing Arts on February 24, model Kendall Jenner wore a dress that pushed the envelope more than most.

During a day and night when lots of A-listers chose a gown with ubiquitous thigh-high split, Jenner went for one that was sideless and backless.

Well, it’s about time someone in her family interpreted a dress code as Full Trash Bag.

It’s now a thing for stars to do a quick change between the ceremony and its favourite after-parties – the Vanity Fair bash, the Governor’s Ball – so that they can have a strong second act.

Moving to the dark side, Gemma Chan ditched her lollipop pink tiered Oscars head turner for a sleek spangled column dress and red lip that shrieked glamour.

Also taking the undone look to the next level: Zoe Kravitz, who wore pretty much a gold bra and a tube skirt.

Miley Cyrus (who arrived at the Vanity Fair party with husband Liam Hemsworth) smashed it by mixing beachy hair with stacks of diamonds and a sequinned plunging dress.

Australian model Shanina Shaik went for a complicated metallic dress that defied gravity, until it didn’t.

Elizabeth Debicki chose an elaborate brocade dress with practical flats and, even more practical, a freedom fighter scarf.

Jennifer Lopez changed from her daytime shiny reptile dress into one that looked like a seahorse had vomited on it.

Stella Maxwell reinvented the flapper look in a beautiful beaded dress with bandeau top. Great hair.

Did Lady Gaga go overboard with the fake tan? She switched up her black Oscars dress for a princess gown with singlet top and that stonking $30 million Tiffany & Co diamond necklace.

In a year when feathers were ditched for bows and pink, Lupita Nyong’o was a standout in fluffy fun white.

Kate Beckinsale also had a crack at feathers, in a mega mini dress with peacock train that might have almost been too much for Lady Gaga.

Ashley Graham was sultry in an off-the-shoulder dress with lots of random bits hanging off it.

Laura Dern’s night-time choice was the same A-line shape as her Oscars dress and looked like a fabulous grown-up sundress. Goals.

Tessa Thompson pulled off the most fashion-forward cocktail look of the night in a bad fairy dress with just the right amount of bling and tulle, anchored with tough boots.

Kate Bosworth took a sunny approach in a golden column with dramatic cape. Ignore the dubious look on the chap’s face.

Vin Diesel and wife Paloma Jimenez looked ready to be the life of the party. Vin was even practising his lines from an invisible book to the obvious delight of his lady.

Total class act Olivia Colman switched her matronly forest green Oscars look for a chic evening number that seemed as British as the Blitz.

Constance Wu ducked into the Vanity Fair bash on her way to a college toga party.

Natasha Lyonne looked really, really cool working an ’80s big shoulders, big hair professional assassin vibe.

Hailee Steinfeld was pretty in a mini made from huge peachy flowers.

Regina King slayed in a coral dress with floaty skirt, off-the-shoulder sleeves and peekaboo neckline. No wonder she looks so happy.

Sofia Vergara discovered how to time travel back to about eight years ago then went shopping for a prom dress.

And Sofia kindly took Maya Rudolph with her.

Tina Fey worked a strapless chocolate number with sea anemone skirt with the cachet that comes from being Tina Fey.

Big question is, how did Molly Sims sit down?

Elizabeth Banks was fantastic in two-piece red with turquoise earrings. She looked free-spirited, as if she was ready to stand on a piano and lead a rendition of Gypsys, Tramps and Thieves. 

Making her first red carpet appearance since revealing she has multiple sclerosis, Selma Blair made her cane look like a dashing accessory to her magician’s assistant swirling cape dress with great neckpiece.

And Melissa McCarthy and Ben Falcone pulled off a joke which made them the envy of everyone strapped into suits, heels and uncompromising gowns: Matching Adidas tracksuits for the marathon of mixing and mingling.