Shirt sleeve should be more than a centimeter long suit sleeves, which not only reflects the level of dress, but also can keep the clean suit cuff.

衬衫袖子应比西装袖子长出一厘米左右，这既体现出着装的层次，又能保持西装袖口的清洁。

youdao

Shoulder and sleeve length -bend arm slightly at elbow, measure from center back of neck, over shoulder and down (with cuff) outside of arm to your wrist.

肩袖长(包括袖克夫)-手臂稍微弯曲，从后颈点，通过肩点，沿着手臂外侧量至腕部。

youdao

The dress pattern doesn't really explain how the cuff joins onto the sleeve.

这个裙样没有真正地示明袖口是怎样与袖子连接在一起的。

youdao

Then he was out, water streaming off him, a piece of ice like a tiny pane of glass in the cuff of his coat sleeve.

NEWYORKER: Tenth of December

On the most expensive suits the cuff buttons, which mirror the pips of military rank, can be undone, allowing the sleeve to be rolled back.

ECONOMIST: Men's clothing