袖子张开的样子在英语中可以表达为 “sleeves are spread open” 或 “sleeves are outstretched”。如果你想要更具体地描述这个动作或者场景，还可以使用以下表达：
- The sleeves are flung back.
- The sleeves are flung wide.
- The sleeves are spread wide.
- The sleeves are thrown back.
- The sleeves are stretched out.
这些表达都能根据不同的语境和需要传达的感觉选择使用。