As much as I love silk, merino wool, and cashmere, nothing beats the good, old cotton. Sezane has a great 100% organic cotton button down that's this Tomboy shirt. It's the one and only white button down I will need. Although I wore it once on a scooter, and one of the button cracked from me bumping against the metal scooter (sad). The shirt did come with a spare button so I could repair it.