1. the sleeves of a shirt
Usage: usually plural
2. a state of being dressed informally without a jacket or coat
Usage: idiomatic; often in phrase ‘in shirtsleeves’

Examples

• He rolled up his shirtsleeves before starting work.
• The stain on his shirtsleeves was clearly visible.
• Despite the formal meeting, he arrived in shirtsleeves.
• The CEO worked in shirtsleeves alongside the employees.
• She noticed the ink marks on her white shirtsleeves.
• The warm weather allowed everyone to work in shirtsleeves.