Joel Ryan/AP
Many rules are rooted in business wear and can be traced back to pamphlets and guides from the early- to mid-20th century. They attempted to guide young businessmen in the right manner of dress so that they wouldn't embarrass themselves at work.
This is all well and good, but styles and societal priorities change. Things that worked in the past might not always work today, as business dress was a lot more conservative back then.
Here are seven style rules that have generally been accepted over time, but that no longer make all that much sense.