There is no cuff rule with sweaters that I am aware of. I regularly wear dress shirts under a sweater and I think it depends on the cuff of the sweater. Unless you have all of your sweaters custom made you will have varying lengths and cuff styles to work with. If the shirt cuff is going to show under a sweater cuff I try to make it a uniform 1/4". If the sweater covers the shirt cuffs I don't force it. I'd call it on a case-by-case basis.
Edited by AmericanGent - 1/14/13 at 7:20am