This article is about trousers for formal day attire. For trousers for informal lounge suit jackets, see lounge suit.
Nancy, and U.S. President Ronald Reagan together with Emperor Hirohito of Japan, both men in morning coats with formal trousers (known as morning dress) (1983).
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Formal trousers, also known as formal striped trousers or colloquially spongebag trousers, are grey striped or patterned formal trousers for day attire in traditional Western dress code, primarily associated with formal morning dress or secondly its semi-formal equivalent black lounge suit. Traditionally made from heavy wool ranging from worsted, melton to partial twill weave, the pattern is most often of a muted design in stripes of black, silver, white and charcoal grey in various combinations (not to be confused with pinstripe or chalkstripe, which are formed of single thin lines spaced equally apart). In addition, formal trousers may also come in check patterns, such as hounds-tooth check, or plaids, although these variants are widely considered not as the most formal.
Although it is possible to create a complete suit out of the same fabric, etiquette limits the morning stripe design to formal trouser.
Typically, formal trousers are intended to be worn with braces with a fishtail back covered by a waistcoat, and have pleats for correct ironing result and comfort. Likewise, for traditional reasons of formality, they do not have turn-ups, since these are considered less formal.