Heavy metal music
Critics disagree over who can be thought of as the first heavy metal band. Most credit either Led Zeppelin or Black Sabbath, with American commentators tending to favour Led Zeppelin and British commentators tending to favour Black Sabbath, though many give equal credit to both. A few commentators—mainly American—argue for other groups including Iron Butterfly, Steppenwolf or Blue Cheer. Deep Purple, the third band in what is sometimes considered the "unholy trinity" of heavy metal (Black Sabbath, Led Zeppelin, and Deep Purple), despite being slightly older than Black Sabbath and Led Zeppelin, fluctuated between many rock styles until late 1969 when they took a heavy metal direction.
Heavy metal fashion
Some of the influences of modern military clothing and the Vietnam War can be seen by the fans and bands of thrash metal, with the members of thrash metal bands of the 1980s like Metallica, Destruction, and Megadeth wearing bullet belts around their waists on stage (it is likely that the thrash metal bands got the idea of wearing bullet belts from NWOBHM bands such as Motörhead, who have incorporated the bullet belt as part of their aesthetic since their inception, since many thrash metal bands in the 1980s were influenced by Motörhead). This style is often connected to punk-metal and anti-fashion, as akin to the hardcore punk scene, as the formentioned style reflects similar attitudes. German Heavy Metal band Accept ex lead singer Udo Dirkschneider also contributed to the military clothing by wearing military pants from 1982, being considered as the first Heavy Metal musician to wear them.