YOU SAID:

what underwear are you hiding under there? Under wear where?

INTO JAPANESE

あなたはその下に何の下着を隠していますか？下着どこ？

BACK INTO ENGLISH

What underwear are you hiding under it? Where is your underwear?

INTO JAPANESE

その下に隠れている下着は何ですか？下着はどこですか？

BACK INTO ENGLISH

What is the underwear hidden under it? Where are your underwear?

INTO JAPANESE

その下に隠されている下着は何ですか？下着はどこですか？

BACK INTO ENGLISH

What is the underwear hidden under it? Where are your underwear?