The casual shirt is the garment you reach for when you are not wearing a suit and do not want to think too hard about it. Which is precisely why it should be exactly right. In the correct weight of cotton or linen, with a collar that sits properly open and a body that tucks or untucks without drama, a good casual shirt does the work of two or three other pieces. These are casual shirts from Alessandro Gherardi, Eton, Fedeli, Coconut Residence, and others who understand that the difference between a casual shirt and a good casual shirt is entirely apparent the moment you put it on.