This year, BAFTA announced that all invitees were given a sustainable fashion guide, asking them to choose outfits for the red carpet with the environment in mind.
Saoirse Ronan in a Gucci dress upcycled from discarded satin.
Guests were encouraged to either re-wear something they already own or hire an ensemble, as opposed to buying something new.
Inviting guests to 'dress sustainably' is a part of BAFTAs increasing efforts to be a carbon neutral awards ceremony this season - such as forgoing award goody bags, a red carpet that is 100 percent recycled and dinner made from sustainable produce.
Daisy Ridley in an Oscar de la Renta dress made using sustainability sourced fabric.
Joaquin Phoenix wore the same bespoke Stella McCartney tuxedo he pledged to wear for the duration of award season for the sake of the climate. So far he's worn it to the Golden Globes, the Critics' Choice Awards and the Screen Actor's Guild Awards.
Kate Middleton arriving at the awards ceremony rewearing an old gown for the occasion.
Adhering to the new green dress code, Kate Middleton re-wears a gold embroidered Alexander McQueen gown. She is accompanied by Prince William, who is also wearing a recycled tux.
The Duchess had first worn the elegant floor-length white gown, which is embroidered with golden hibiscus flowers, to a state dinner in Malaysia in 2012.
Sustainable Style Guide
Created by the London College of Fashion, the set of fashion guidelines informs how to make sustainable choices on the red carpet - whether through renting, rewearing or buying vintage. Encouraging celebrities to opt for sustainable fashion brands - such as Stella McCartney and Reformation, reknowned for using innovative and eco-friendly materials - and to showcase green design at the world stage of the awards ceremony. The guide also urged guests to make the most out of rental fashion sites by providing a list of pre-approved rental companies and online resale destinations where they can go in order to promote greater lifespan of their clothing.
Read the sustainable fashion guide created by the London College of Fashion here.