YOU SAID:
I did not put the costume on the duck
INTO JAPANESE
アヒルに着ぐるみはつけませんでした
BACK INTO ENGLISH
I didn't put a costume on the duck
INTO JAPANESE
あひるに着ぐるみはつけませんでした
BACK INTO ENGLISH
I didn't put a costume on the duck
That didn't even make that much sense in English.