Show cuff.

Show .25 – to 1 inch of shirt cuff when you wear a suit or sport jacket, depending on what makes you comfortable. If you have long arms, too-long sleeves can make them seem even longer. Even if you have short arms, too-long sleeves can make you appear a bit swamped in your suit.
Ever problematic when I buy off the rack because of my ape-like arms, even when jackets are adjusted to make the sleeves longer, I end up showing too much of my custom-made shirts ‘ cuffs – but I would still say better too much than none at all.