100% cotton. Used a handful of times to go to work, it is very comfortable and works great with some leggings for a professional look or jeans for a more casual look. Description from Hatch: “the Cecily Blouse is your answer to chic tunic dressing but with an autumnal bent. This great everyday top features loose-fitting long sleeves that conjure up a romantic, slightly Bohemian vibe. Cecily is great for a casual hang or weekday meeting, and its top buttons and bib detailing is a stylish, nursing-friendly add.The Cecily Blouse is worn here with The Nearly Skinny Jean.*If in-between sizes, please size down or reference measurements below!”