Here is where biomechanics enters the conversation. When you walk, stand, or shift in a chair, your calf muscle contracts and expands rhythmically. The textile of a dress sock is designed to look refined, not to grip aggressively. Most formal hosiery is made from fine wool, silk blends, or thin cotton, none of which have the elastic memory to maintain upward tension after repeated movement. Without intervention, gravity and friction work together to pull them down.