shirt-sleeve

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

    The part of a shirt that covers an arm.

adjective
  1. 1

    Having an informal, relaxed appearance or approach, particularly in business.

    โ€œHe had a shirt-sleeve style of management.โ€

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