We all know that a denim shirt is a classic, versatile wardrobe staple that every woman must own. It can be worn in any season, any climate and with whatever is your style. Be it preppy, boho, girly, classic or undefined a denim shirt will work, once you find the right one for the look you're aiming at.
I've had this one for the longest time and it still works great for me whenever I want to make a look casual.
Patricia skirt / Marian Grey shoes / Limmat shirt