Why did all the stars wear black on the red carpet at the BAFTAs, and why can't the Duchess of Cambridge wear black?

You caught your eye that black color yesterday evening that shrouded the red carpet of the British Academy of Film and Television Arts Awards, known as BAFTA, which was held at the famous Royal Albert Hall in London, in the presence of many celebrities and stars.
The adoption of black as a primary color for the looks of the stars, after its recent adoption at the "Golden Globes" ceremony, constituted a new message in support of the TimesUp campaign and the hashtag "me too" against sexual harassment in Hollywood and the world. This makes fashion an effective means that raises the voice loudly to express an opinion and position, and a rejection of an unacceptable reality. Who were the most prominent supporters of this campaign, which has recently turned into a global issue?

However, the Duchess of Cambridge could not choose black for her appearance to avoid violating the protocol that prevents members of the British royal family from expressing any support for political and social movements. She wore a dark green Jenny Packham gown that she accessorized with a black velvet ribbon at the waist and diamond jewellery.