In an open letter to Prime Minister Boris Johnson, more than 400 executives and creatives said that the current agreement with the European Union will “decimate” the £35 billion fashion and textile industry, with new taxes and tariffs, as well as travel restrictions, making it increasingly difficult to conduct business.

Cosignatories include designer Roksanda Ilincic, photographer Juergen Teller, Dazed Media’s Jefferson Hack and others.

“To survive post-Brexit and safeguard our future, we need to ensure we can trade with overseas businesses and are also supported to grow the internal market,” the organisers said in a release.

Fashion entrepreneur Samantha Cameron, whose husband called the 2016 Brexit referendum when he was prime minister, said last week that she was having difficulty conducting business in a post-Brexit world, according to The Financial Times.