Plus-size model and activist Tess Holliday kicked off Saturday's Teen Vogue Summit with an empowering message about body positivity, diversity, and taking up space. In conversation with Teen Vogue Features Director Brittney McNamara, Holliday took the Summit stage to talk about her new book, Take Up Space, Y'all, a guide to feeling comfortable and confident in your teen years. Holliday, known for her long-running diversity campaign #EffYourBeautyStandards, also tackled the importance of inclusion — from race to ability, gender, and beyond. Related: Tess Holliday and Fashion to Figure Release #EffYourBeautyStandards Capsule Collection“I'm like, that is not how it works,” she said of the comments. Wearing a pink sheer dress on stage at Summit, she said having fun with clothes is essential — no matter what age or size.