I was in the archives of Coporette and saw a comment about always wearing shirt collars inside your jacket and not outside or over the jacket collar. Is this a more formal business wear "rule" or is it just a style choice? Do you have an opinion as to which is better or does it depend on the outfit itself and/or the formality of the occasion? I've been wearing shirt collars on the outside for ages and I'm just curious if I've been breaking the "rules"?