"second skin" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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        {
          "text": "Near-synonym: one's element."
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          "ref": "2012, A Memoir of Love:",
          "text": "\"Hey!\" Alex sputtered as soon as she got Clare's foaming wake out of her face. She knew she could still beat her even with the head start though. Water was like a second skin to her and Clare had only half her skill.",
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      "glosses": [
        "Describing something which so perfectly suits one that one does not notice it."
      ],
      "id": "en-second_skin-en-noun-z4hBGsHz",
      "synonyms": [
        {
          "word": "one's element"
        }
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      "glosses": [
        "Describing clothing that is extremely form-fitting."
      ],
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          "form-fitting#English"
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  "word": "second skin"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "examples": [
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          "text": "Near-synonym: one's element."
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          "ref": "2012, A Memoir of Love:",
          "text": "\"Hey!\" Alex sputtered as soon as she got Clare's foaming wake out of her face. She knew she could still beat her even with the head start though. Water was like a second skin to her and Clare had only half her skill.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Describing something which so perfectly suits one that one does not notice it."
      ],
      "synonyms": [
        {
          "word": "one's element"
        }
      ]
    },
    {
      "glosses": [
        "Describing clothing that is extremely form-fitting."
      ],
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        [
          "form-fitting",
          "form-fitting#English"
        ]
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    }
  ],
  "word": "second skin"
}