noun
farm work clothes; field work clothes
Refers to durable, practical clothing worn for agricultural or outdoor manual labor.
祖父は毎朝、野良着に着替えて畑に出かける。
Every morning, my grandfather changes into his farm work clothes and heads out to the fields.
作業着 is a broader term for work clothes in general, including factory or construction work, while 野良着 specifically refers to clothes for farm or field work.
Compound of 野良 (のら, 'field' or 'farm') and 着 (ぎ, 'clothing'). The reading ぎ is a rendaku form of 着 (き).