YOU SAID:

When it was raining, I put my boots on.

INTO JAPANESE

雨が降っていたので、長靴を履いた。

BACK INTO ENGLISH

It was raining, so I put on my boots.

INTO JAPANESE

雨が降っていたので、長靴を履きました。

BACK INTO ENGLISH

It was raining, so I put on my boots.