Translation of "속옷차림으로" in English

'속옷차림으로!' (웃음)

in our underwear."

'만리장성을 걸어보자! 속옷차림으로!'

let's go walk the Great Wall in our underwear,

'피라미드 위로 스카이다이빙을 하자! 속옷차림으로!'

Let's go sky-diving into the pyramids in our underwear,