French cuff shirts are considered more formal, for dressing up and are the ideal business wear (particularly with the use of high quality cufflinks). However, one major false impression is that a French cuff shirt cannot be worn
with open cuffs. I STONGLY DISAGREEE. A French cuff dress shirt can be
worn with open cuffs. Brad Pitt in Ocean Eleven is the prefect example
for the unbuttoned French cuff. The following picture will get my point
across.