YOU SAID:

Whose coats that jacket

INTO JAPANESE

誰のコートは、そのジャケット

BACK INTO ENGLISH

whose coat is that jacket

INTO JAPANESE

そのコートはあのジャケット

BACK INTO ENGLISH

That coat is that jacket.

INTO JAPANESE

あのコートがあのジャケットです。

BACK INTO ENGLISH

That coat is that jacket.