InStyle Essentials Women's White Classic Button Front Shirt by Bra Size Cotton-blend Shirt uses TrioFit Technology, which sizes shirts by bra size for a form-flattering fit. An extra button over the bustbut hidden under the placketprovides added security, so no more peekaboo. The timeless styling works for day or night, work or weekend, and the super-flattering princess seams hug curves just so. 97% cotton, 3% spandex