Personalized Happy Pi Day Math Holiday Women's Plus Size V-Neck. Pi Day Women's Plus Size V-Neck - Hot Pink has cute baked pie filled with math symbols. Fun shirt for students or teachers on Pi Day. So comfortable you'll want one in every color! These versatile v-neck t-shirts are great to wear to the office or at a weekend BBQ with friends. Available in a wide range of colors to compliment any wardrobe, these shirts are softly shaped to complement a plus sized woman's curves.