tracksuit bottoms

Britain plural plural-only

(Britain) A type of soft, lightweight trousers used for sports or informal occasions, (US) sweatpants.

Japanese Meaning

運動用やカジュアルな場面で着用される、柔らかく軽量なズボン（通称：スウェットパンツ）

On chilly mornings she prefers to wear her worn grey tracksuit bottoms for the commute because they're comfortable.

肌寒い朝は、彼女は通勤のために着古した灰色のスウェットパンツを履くことを好む。

Sense（1）

(Britain) A type of soft, lightweight trousers used for sports or informal occasions, (US) sweatpants.