letterman jacket
noun [ C ] US uk/ˈlet.ə.mən ˌdʒæk.ɪt/ us/ˈlet̬.ɚ.mən ˌdʒæk.ɪt/ (UK baseball jacket)
棒球服
a jacket, often with sleeves that are a different colour from the rest of the jacket, that fits tightly round the waist and fastens with a zip