新しいドレスを着て

wearing a new dress

→ 新しい
phrase Rare #45,278
wearing a new dress The て-form connects this phrase to what happens next, often describing what someone is wearing while doing something.
JA: 新しいドレスを着て、パーティーに行きました。
EN: I went to the party wearing a new dress.

買ってもらった新しいドレスを着て私も踊るのよ

I'm going to wear the new dress you bought me and dance, too.

— When Marnie Was There (2014)

彼女は新しいドレスを着てうれしそうだった。

She looked happy wearing her new dress.

新しいドレスを着て彼女はとても美しく見えました。

She looked very beautiful in her new dress.