。
She put on a new jacket.
Literal
She [topic-は] new jacket [object-を] wore.
着る (きる) is the verb for wearing garments on the upper body — coats, jackets, shirts, dresses. 上着 (うわぎ) specifically means an outer garment like a jacket or coat. Japanese distinguishes between putting on (着る, past tense 着た for the act) and wearing as a state (着ている, ongoing).