She is dressing.She is dressing her baby.
前两句都是对的，而最后一句是错的，因dress已包含衣服，后面就不用再加表示衣服的词了。

He doesn't seem to care much about dress.
他看起来不怎么注重穿着。

He wears a blue dress.
这个句子是错误的，不可用。

I didn't recognise him because he was dressed in a dark suit.
他穿着黑色的西装时，我没有认出他来。

The children dressed themselves up as angels to attend the ceremony.
孩子们把自己打扮成天使去参加典礼。