How Uniqlo's HeatTech took over the world

Uniqlo’s HeatTech underwear is 15 years old, and this week launches a new collaboration with Alexander Wang. The company’s head of design, Katsuta-San, explains why it’s all we want to wear in winterAnother week, another designer/high street collaboration – although this week there happened to be two.In one corner, there was the much-hyped Moschino collaboration with high street brand H&M, which had a small but visible queue outside its flagship store on Thursday morn