Context (1)
In some countries, e.g. Britain and many Caribbean states, it is common for school pupils
to have to wear distinctive uniforms identifying them with a particular institution,
especially to the end of compulsory education at 16. In others, e.g. France, the USA, it is
rare for uniforms to be worn, although some private schools may retain them. In both
situations the desirability of school uniforms remains controversial among students,
parents and educationalists. As a result of this some schools have abandoned uniform at
the same time as others have adopted it.

Arguements:

Pro

Uniform helps to create a strong sense school
ethos and a sense of belonging to a particular
community. As such it promotes discipline and
helps to drive up academic standards, which is
why a uniform is often adopted by schools
which are being reopened with a fresh start
after being classified as failing.

Con

Uniform suppresses individualism and treats
students en masse rather than encouraging
teachers to recognise their different characters
and abilities, and students to accept
responsibility for aspects of their own lives.
Uniform was better suited to an age of rote
learning and military-style discipline than to
the more exploratory and creative values of
modern education – values which are
increasingly important to the wider economy.
Many schools, indeed many countries, manage
to maintain high school standards of discipline,
community and academic performance without
adopting uniform.

Uniform acts as a social leveller, under which
all students are equal in the eyes of the school
and of each other. In institutions without
uniform students are often competitive and
worry endlessly about their appearance and the
clothes they should wear. Pupils without
expensive designer clothes and trainers may be
singled out as social outcasts, or stigmatised as
being from poor backgrounds. For these
reasons many parents prefer uniforms as they
save them money on buying clothes for school
wear.
Students always find ways to tease or bully
others, regardless of what clothes are worn.
Those who wish to be particularly fashionable
will want to own the same number of outfits
regardless of whether they are allowed to wear
them to school or not, changing into them the
minute that classes are over. Parents often find
some uniform items, e.g. jackets, very
expensive compared to the rest of their child’s
wardrobe, and complain they can never be
worn outside the school environment.
Uniform has practical benefits when students are outside the school building. Being readily
identified with a particular institution may
make students more aware of their behaviour
while travelling to and from the school, leading
them to act more considerately, e.g. to other
passengers on buses or trains. On organised
trips away from the school it is much easier for
teachers to ensure they haven’t lost anyone and
to monitor behaviour, than if students wore
their own clothes and blended in with the
crowds.
Uniform makes students very identifiable and emphasises the divisions between schools,
making it very easy for bullying and fights to
develop between students from rival
institutions as they travel to and from school.
Uniform prepares students for life after
education, when most will be expected to dress
smartly and appropriately for work, adhering to
a corporate dress code.
The business world is increasingly relaxed
about dress codes, making those schools that
insist on uniform increasingly anachronistic.
Adults who attended schools without uniform
do not appear to struggle in the workplace.
Uniform makes it easy to check that every
student maintains a smart appearance and is
dressed appropriately for their classes. In
schools where students are allowed to dress as
they like, in practice a constant battle has to be
fought by staff to ensure that what the students
choose to wear is not inappropriate, e.g.
because it is too revealing, features T-shirts
with offensive slogans, would be dangerous
while performing scientific experiments, etc.
Often it is uniform that is inappropriate, being
too cold in winter or too hot in summer, largely
because it is badly designed and cheaplyproduced
in small quantities for a captive
market. Girls in particular complain at being
forced to wear skirts even in the coldest
months, when many would generally wear
trousers from choice and some, e.g. Muslims,
for cultural reasons. Students will always
attempt to subvert any dress code, strict or
lenient, requiring staff vigilance in any case.
   

1 I greatly acknowledge the International Debate Education Association for this summary.
http://www.idebate.org/debatabase/topic_details.php?topicID=59