Fashion is a popular aesthetic expression at a particular time, place and in a specific context, especially in clothing, footwear, lifestyle, accessories, makeup, hairstyle, and body proportions. Whereas a trend often connotes a peculiar aesthetic expression and often lasting shorter than a season, fashion is a distinctive and industry-supported expression traditionally tied to the fashion season and collections. Style is an expression that lasts over many seasons and is often connected to cultural movements and social markers, symbols, class, and culture (ex. Baroque, Rococo, etc.). According to sociologist Pierre Bourdieu, fashion connotes "the latest fashion, the latest difference."

Even though they are often used together, the term fashion differs from clothes and costumes, where the first describes the material and technical garment, whereas the second has been relegated to special senses like fancy-dress or masquerade wear. Fashion instead describes the social and temporal system that "activates" dress as a social signifier in a certain time and context. Philosopher Giorgio Agamben connects fashion to the current intensity of the qualitative moment, to the temporal aspect the Greek called kairos, whereas clothes belong to the quantitative, to what the Greek called Chronos.