In American English, shirt can refer to almost any upper-body garment other than coats, especially in menswear and bras (the term "top" is sometimes used in ladieswear). In British English, a shirt is more specifically a garment with a collar, cuffs, and a full vertical opening with buttons; what is known in American English as a dress shirt.
In the 19th century, the idea of underwear developed, which had not been common before. At some point near the turn of the century, the underwear shirt was developed; the shirt was always a part of clothing since ancient Egypt, though it slowly became more and more popular.
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