Showing a little cuff under a jacket or sweater always looks elegant. Typically, a ¼” or ½” flash of cuff is best. In fact, a lack of visible cuff is often perceived as untidy or ill-considered, lacking polish.
Cuffs have always served to anchor the sleeve. Traditionally, they would fasten with ribbon, replaced by traditional links as time went on. These were double cuffs, and the term still applies today, with double cuffs sometimes referred to as French cuffs instead.
Recent years have seen a rise in popularity in button cuff shirts, known more generally as single cuffs. This is thanks largely to their increased acceptance into the work wardrobe as well as the perfect, most convenient and comfortable option for casual dress too.
A single cuff with a cufflink is best saved for white tie dress only.