Prior to the 1960's jeans were considered mostly as a work outfitworn by blue collar workers and people working around their house. Thensomewhere around 1965 they became popular with teens as a very casual laidback statement. Then about 25 years ago

Prior to the 1960's jeans were considered mostly as a work outfit worn
by blue collar workers and people working around their house. Then
somewhere around 1965 they became popular with teens as a very casual
laid back statement. Then about 25 years ago jeans started to step
outside the blue collar environment into corporate America.

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Today, while jeans have not taken over corporate America, they are
still very much worn at work. Deciding what to wear to work is usually
governed by the dress code your company has. Some companies have
strict dress codes, meaning no jeans, no sneakers etc. Other companies
have what they call "business casual" attire, which may or may not
include jeans. Still some companies require strict dress codes Monday
through Thursday, and have what they call "casual Fridays." This may
be considered "business casual" or jeans and sneaker casual (Yes, it
can get a little confusing).

So what does the employer think about when setting the dress code?
About 25 years ago, some employers started to adapt to the concept
that a relaxed dress code would make a more relaxed atmosphere, and a
more relaxed atmosphere would make more efficient workers. However
some employers feel that a casual laid-back dresser might be too laid
back and careless about their work. They feel dressing up will cause
employees to take their job more seriously. Also, depending on the
type of business, they feel that customers or clients may not take a
casually dressed office as seriously as an office where everyone is
dressed in business attire.