YOU SAID:
I'd like a larger hat please.
INTO JAPANESE
大きな帽子をお願いします。
BACK INTO ENGLISH
I'd like a big hat.
INTO JAPANESE
大きな帽子が必要です。
BACK INTO ENGLISH
I need a big hat.
INTO JAPANESE
私は大きな帽子が必要です。
BACK INTO ENGLISH
I need a big hat.
That didn't even make that much sense in English.