Loungewear Shorts

loungewear
Casual, comfortable clothing suitable for wearing at home
clothing suitable for relaxation

shorts
Short pants that reach only to the thighs or knees
short pants: trousers that end at or above the knee
(short) primarily temporal sense; indicating or being or seeming to be limited in duration; "a short life"; "a short flight"; "a short holiday"; "a short story"; "only a few short months"
Men's underpants
drawers: underpants worn by men