And the perfect shirt cuff length is at the very beginning of your hand, without advancing on it, without biting a little bit of your hand or without showing a little inch of your wrist’s skin. Pretty much how the photo illustrates below.

And this length is essential for a shirt with a single cuff, double cuff or any cuff, wearing a shirt solo or with a blazer, a jacket or a coat.
This way your shirt cuff detail will always be spot on.