イージーパンツ

noun

loose-fitting pants with an elastic or drawcord waist

Wasei-eigo from 'easy pants'; refers to casual, comfortable trousers with a stretchy or adjustable waistband, often worn at home or for relaxed outings.

wasei-eigo (Japanese-coined English), from easy pants

• 家いえではいつもイージーパンツをはいている。