How It Should Fit: Above your wrists, never past the heel of your palm
Jacket sleeve showing about 0.5″ of shirt cuff. This is considered almost universally appropriate.
Jacket sleeve too short, showing more than 1″ of shirt cuff.
Jacket sleeve too long, falling past the shirt cuff.
Local Tailoring: Can a tailor adjust my jacket sleeve length?
Jacket Sleeve vs. Shirt Sleeve Length Measurement
Jacket Sleeve vs. Shirt Sleeve Measurements: Why are they different?
Different Sleeve Lengths: What if one of my arms is longer/shorter than the other?
You can make your jacket sleeve lengths different in your account.