Buttoning a shirt involves fastening the buttons through their corresponding buttonholes. Start by holding the shirt in front of you, ensuring the collar is at the top. Begin with the bottom button and work your way up, aligning each button with its hole. To button a shirt, insert the button into the hole and pull it through until it is secure. Repeat this process for each button, adjusting the fabric as needed to ensure a smooth appearance. Once all buttons are fastened, the shirt will fit comfortably and look neat, ready for wear.