Business casual

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Western dress codes and corresponding attires
Formal (full dress)   White tie  Morning dress  Full dress uniform Frock coat  Evening gown  Ball gown
Semi-formal (half dress)   Black tie  Black lounge suit   Mess dress uniform Evening gown  Cocktail dress
Informal (undress, "dress clothes") Suit  Service dress uniform Cocktail dress  Pantsuit
Casual (anything not above) Business casual Casual Friday Combat uniform Smart casual Workwear Streetwear Sportswear known as Sportswear (fashion) and Athleisure Undress
Supplementary alternatives Ceremonial dress law courts royal courts diplomatic academic, etc. Religious clothing cassock, habit, etc. Folk costume Distinctions Orders medals, etc.
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Business casual is an ambiguously defined Western dress code that is generally considered casual wear but with smart (in the sense of "well dressed") components of a proper lounge suit from traditional informal wear, adopted for white-collar workplaces. This interpretation typically including dress shirt and trousers, but worn with an odd-coloured blazer or a sports coat instead. Neck ties are optional in this category.

Acceptance of business casual in the United States was preceded by Casual Fridays which originated in California in the 1990s, in turn inspired by the Hawaiian 1960s casual custom of Aloha Friday.^[1][2] The designation of particular clothing pieces as "business casual" may be contentious.