Humans, including those in the fashion world, are creatures of habit—with days punctuated by highly specific rituals. In our series On Repeat, creative people tell us about the one thing they rely on while making their work. From the “Sex and the City” episode that always motivates Ryan Lo to Marine Serre’s athlete-like hydration, to the playlist that Kerby Jean-Raymond of Pyer Moss has been perfecting since 2006, here are the things that propel designers to their deadlines, with illustrations by Filipe Jardim.