shirt-sleeves

/SH ER1 T S L IY0 V Z/
noun
  1. 1

    The part of a shirt that covers an arm.

noun
  1. 1

    Preceded by in: wearing only a shirt without a coat, jacket, or comparable protective covering over it.

  2. 2

    (by extension) A working-class socioeconomic status (not requiring a professional business jacket).

Source: https://en.wiktionary.org/wiki/shirt%20sleeve, https://en.wiktionary.org/wiki/shirt%20sleeves, https://en.wiktionary.org/wiki/shirt-sleeve, https://en.wiktionary.org/wiki/shirt-sleeves