"boiled shirt" meaning in English

{
  "etymology_templates": [
    {
      "args": {},
      "expansion": "^([sic])",
      "name": "sic"
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  ],
  "etymology_text": "John Camden Hotten's Slang Dictionary (1873) states: \"In the mining camps, and rough parts generally, a white shirt is called a biled^([sic]) shirt to distinguish it from the usual woollen garment, which cannot be boiled.\"",
  "forms": [
    {
      "form": "boiled shirts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "boiled shirt (plural boiled shirts)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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      "glosses": [
        "A freshly laundered white shirt."
      ],
      "id": "en-boiled_shirt-en-noun-O7rw0g~M",
      "raw_glosses": [
        "(dated) A freshly laundered white shirt."
      ],
      "tags": [
        "dated"
      ]
    }
  ],
  "word": "boiled shirt"
}

{
  "etymology_templates": [
    {
      "args": {},
      "expansion": "^([sic])",
      "name": "sic"
    }
  ],
  "etymology_text": "John Camden Hotten's Slang Dictionary (1873) states: \"In the mining camps, and rough parts generally, a white shirt is called a biled^([sic]) shirt to distinguish it from the usual woollen garment, which cannot be boiled.\"",
  "forms": [
    {
      "form": "boiled shirts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "boiled shirt (plural boiled shirts)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English dated terms",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "A freshly laundered white shirt."
      ],
      "raw_glosses": [
        "(dated) A freshly laundered white shirt."
      ],
      "tags": [
        "dated"
      ]
    }
  ],
  "word": "boiled shirt"
}