un·der·wear 
/ˈʌndɚˌweɚ/ noun
/ˈʌndɚˌweɚ/ noun [noncount] : clothing that is worn next to your skin and under other clothing
▪ He answered the door in his underwear. [=while wearing only underwear] ▪ You should pack a change of underwear. [=additional underwear that you can wear at another time] ▪ long/thermal underwear [=winter underwear that covers your arms and legs]
▪ He answered the door in his underwear. [=while wearing only underwear] ▪ You should pack a change of underwear. [=additional underwear that you can wear at another time] ▪ long/thermal underwear [=winter underwear that covers your arms and legs]
