The one thing all romantic comedies have in common? They celebrate the two things everyone wants in life—rom and com, of course. To honor that, we’re devoting a whole week to the genre. More on the rom-coms we love, past and present, here. In a romantic comedy, the fashion helps tell the story just as much as the dialogue—especially if that story involves a transformation. If a character goes from wearing all black to pastels, for example, that might signify a change in mood from dark to light. If she goes from wearing pajamas to power suits (or the other way around), it might suggest an increase in confidence or a decrease in stress levels. Whatever the case, a rom-com character’s choice in clothing is anything but an accident. Here, we ask costume designers to share their behind-the-scenes stories about nine iconic looks in romantic comedies to prove just that. Find out how Jennifer Garner’s 13 Going on 30 “Thriller” dress came to be, surprising details about The Wedding Planner wardrobe, and so much more. One of the most memorable scenes from Jennifer Garner’s Ariana Grande–approved romantic comedy—in which Garner plays Jenna, a sweet 13-year-old girl...