McGough said: “I started the poem and left it and then when I got the idea of addressing the trousers it happened quite easily.

“When I actually got writing it it took me just over a week.”

World Museum Liverpool’s Beat Goes On exhibition explores the city’s musical identity from the Beatles to the Zutons.

Memorabilia on display includes a jacket worn by John Lennon during the Beatle’s 1964 tour and the All You Need is Love bedcover from John and Yoko’s 1969 Bed-in-for-Peace demonstration in Montreal.

The trousers will be on display until November 1 when the exhibition closes.

A collection of McGough’s own belongings, along with those of the other two Liverpool Poets Brian Patten and the late Adrian Henri, went on display at Liverpool University’s Victoria Gallery and Museum last week.

The three made their name in the 1960s with their accessible poetry printed in joint anthologies including The Mersey Sound from 1967.

Selling more than one million copies, the book became one of the most popular poetry collections ever published.

McGough’s reworking of Moliere’s Tartuffe was a highlight of Liverpool’s Capital of Culture year and his version of the French playwright’s The Hypochondriac opens at the Liverpool Playhouse next month.