casual shirt 译为：休闲衬衫
dress -shirt n.
[牛津高阶] shirt,sometimes with a frilly front ,worn with a dinner jacket 礼服衬衫（有时前襟有褶边装饰）
例句：
The tiny leaves had recreated every curve and nuance of Jacob's face and hair ,and oddly ,the body wore the same clothes it had when she killed him :jeans and a dress shirt ,rolled up at the sleeves.
细小的叶子重现了雅各布脸部和头发的形状和颜色，而且很奇怪，他身上穿的衣服跟她枪杀他时穿的是一模一样：牛仔裤和一件礼服衬衫，衣袖卷了起来。