YOU SAID:

I never saw a man wearing so many hats

INTO JAPANESE

たくさんの帽子を身に着けている人を見たことがないです。

BACK INTO ENGLISH

Have not seen who wears many hats.

INTO JAPANESE

多くの帽子を着ている人を見ていません。

BACK INTO ENGLISH

Have not seen who wears many hats.