Imagine trying to run a race or do hard work with your robe dragging on the ground. That's the picture here!
The phrase "loosens the belt of the strong" is a vivid image from ancient culture. People wore belts to hold their robes snug, allowing them to move freely for work, travel, or battle. Without the belt, their long garments would get in the way, making them ineffective and vulnerable.
God's action here is to remove the 'belt' of strength and authority from powerful individuals. He can instantly dismantle their might, their influence, and their ability to act decisively.
This isn't just about physical strength, but also about the power derived from wealth, armies, or political position. God can simply 'unbelt' them, rendering them helpless and unable to perform the very actions that defined their strength.