Baggy pants on young men could be spotted early in the 1990s, but they remained a largely "underground" style, worn only by a limited number of people pushing the edge of style, until hiphop replaced grunge as the dominant music form among urban teenagers. By the mid-1990s long baggy shorts became common. Youngsters now demanded that jeans, which had long been a major part of casual dress, be as baggy as possible, with waists several sizes too large revealing the upper band of underwear. Retailers like Gap and Old Navy introduced baggy lines of jeans. Designer Tommy Hilfiger (1951–) created an "urban prep" line, copying a street style he observed in which baggy denim was paired with crisp white button-up shirts.Explanations vary as to why baggy jeans became so popular. Some claim that trendsetters in the hip-hop community adopted the style to copy the pants that prisoners are issued when they are incarcerated.