Robert Plant's blue "Nurses Do It Better!" T-shirt, worn during Led Zeppelin's final US shows in Oakland in July 1977, has become one of rock's most enduring style symbols. The garment's origin is disputed: some accounts say a fan threw it onstage and Plant laughingly replied "I know!", while others believe it came from his own wardrobe as a tribute to his then-wife Maureen, who worked as a nurse. Either way, the image has since been widely reproduced by fans, and Plant himself released an official version of the shirt through his website in 2018.

The concerts at the Day on the Green festival on 23 and 24 July 1977 proved historically significant beyond fashion, marking Led Zeppelin's last-ever performances in the United States. Two days later, Plant's five-year-old son Karac died suddenly of a stomach virus, prompting the cancellation of the remaining tour and a hiatus until November 1978. A planned 1980 US tour was subsequently scrapped following drummer John Bonham's death that October, which led to the band's split, cementing the Oakland shows' place in rock history.