The Great British Sewing Bee

Joe Lycett hosts the semi-final, as the four remaining sewers go to the movies, taking on garments and techniques from the silver screen.

First, the semi-finalists must follow a pattern like none they've encountered before, as judges Patrick Grant and Esme Young ask them to make a dress inspired by Marilyn Monroe's in The Seven Year Itch. The techniques involved in creating the iconic halter-neck dress include a bagged-out ruched bodice and perfectly inserted pleated skirt. 

Next, it's the transformation challenge, with the haberdashery transformed into a futuristic scrapyard. From the junk, the sewers have to create a science fiction-inspired outfit in just 90 minutes, making imaginative use of the hardware supplied.

For their final challenge, the made to measure, the sewers take on the Jazz Age with a flapper dress inspired by films like The Great Gatsby. Tasked with creating a dazzling dress fit for dancing the night away, they must ensure their dresses skim the model's body, are heavily beaded and stretch out of shape. But only three of these four incredibly talented sewers can make it through to the grand final.