m-w
Not rocket science, surely?
Main Entry: 1ca·su·al
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Function:
adjective Etymology: Middle English, from Anglo-French & Late Latin; Anglo-French
casuel, from Late Latin
casualis, from Latin
casus fall, chance — more at
case Date: 14th century 1
: subject to, resulting from, or occurring by chance <a
casual meeting>2 a
: occurring without regularity
: occasional <
casual employment> b
: employed for irregular periods <a
casual worker> c
: met with on occasion and known only superficially <a
casual friend>3 a (1)
: feeling or showing little concern
: nonchalant <a
casual approach to cooking> (2)
: lacking a high degree of interest or devotion <
casual sports fans> <
casual readers> (3)
: done without serious intent or commitment <
casual sex> b (1)
: informal ,
natural <a
casual conversation> (2)
: designed for informal use <
casual clothing>
synonyms see
accidental,
random
Main Entry: 1for·mal
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Function:
adjective Etymology: Middle English, from Latin
formalis, from
forma Date: 14th century 1 a
: belonging to or constituting the form or essence of a thing <
formal cause> b
: relating to or involving the outward form, structure, relationships, or arrangement of elements rather than content <
formal logic> <a
formal style of painting> <a
formal approach to comparative linguistics>2 a
: following or according with established form, custom, or rule <lacked
formal schooling> <a
formal dinner party> <
formal attire> b
: done in due or lawful form <a
formal contract> <received
formal recognition>3 a
: characterized by punctilious respect for form
: methodical <very
formal in all his dealings> b
: rigidly ceremonious
: prim4
: having the appearance without the substance <
formal Christians who go to church only at Easter>
synonyms see
ceremonial
Skimming these definitions makes me think that casual/formal is really a matter of attitude ... that Chanel can be worn in a casual, nonchalant way, and jeans & Keds can be worn in a formal way (a la ramrod).