This document discusses the costume design and choices in three British films - Kidulthood, Fish Tank, and This is England. For Kidulthood and Fish Tank, the document notes that casual, realistic clothing like caps, hoodies, and trousers were used to portray teenagers and increase realism. For This is England, a wider range of costumes were used, from casual to business wear, to appeal to more audiences and show the progression of fashion from the 1980s. The document discusses how these costume choices in the films could provide inspiration for the document author's own film project focusing on teenagers, while This is England may be less relevant due to its 1980s setting.