(soaked|wet|drenched) to the skin

completely covered with water or some other liquid

The idiom "soaked to the skin" originates from the literal meaning of being completely saturated with water, to the point where it penetrates through one's clothing and reaches the skin. The phrase is used to emphasize the thoroughness and intensity of being wet, suggesting that one is soaked to the point of experiencing moisture directly on their skin. In other words, it conveys a state of extreme wetness, often due to heavy rain, immersion in water, or being exposed to a significant amount of liquid.

After walking home in the pouring rain, she was soaked to the skin, with her clothes clinging damply to her body.
The swimmer emerged from the pool, drenched to the skin, water dripping from every part of her body.
The sudden downpour caught them off guard, leaving them wet to the skin within minutes, their clothes completely soaked.
Despite wearing a raincoat, the hiker got caught in a storm and ended up drenched to the skin, his boots squelching with every step.
They decided to have a water fight in the backyard, and within minutes, everyone was soaked to the skin, laughing and shivering in the cool water.