by vgevge The definition of casual of course depends on just how dressy the office is to begin with. At some business offices slacks and sport shirts are the status quo. So the idea of going more casual seems somewhat silly.
However, by the same token, a business that generally expects suits and ties has not (from what I've been able to see) been particularly comfortable with employees showing up in jeans and t shirts.
Casual in a business situation has actually gotten a little dressier. Perhaps the suit and tie are given a rest occasionally, but they can be replaced with sport coats, dress trousers, and turtlenecks all made from good fabrics (wool, silk or luxurious man made fibers). Casual should never be sloppy or unkempt. There are a lot of great shirts, pants, and jackets available that can be combined into wonderful looks.
Also, men 's suits are so great now that I think a lot of men like to wear them. The new fabric combinations and lines are flattering and very handsome.