McCartney told the Mail on Sunday May 12, 2008 about this song: "For me this is about my clothes from the 60's and the fact that what's out comes back - fashion going round in circles. I meet quite a few young guys in bands and a question they always ask is, 'Did you keep the clothes?' As a matter of fact I did. The Beatles had a tailor, Dougie Millings - he's in a scene in A Hard Day's Night. Instead of just going to get a suit as you did before, for a job interview or whatever, suddenly you were going to get epaulettes and fancy buttons, materials and linings. That to me is where the song is coming from. The message is: vintage clothes are great but don't live in the past."
In the same Mail on Sunday interview McCartney explained that this was the first of a suite of songs on the Memory Almost Full album. He said: "It's the opening of a medley. The next four songs are designed to run together, with this as the opener. I hadn't done that since Abbey Road and I thought it would be quite nice to flirt with that idea again. It just means it's a slightly longer form. You've got to think, 'What came before?' 'What statement are you going to make now?' 'How's this going to lead on?' It's not that different from just sequencing an album, but you suddenly think of them as a suite of songs, and it's interesting to write them in that way."
The lyrics for Lesley Gore's "It's My Party" were based on actual events relating to his daughter Judy's sweet 16 party. The teenager threw a tantrum and burst into tears when her mum and dad insisted that her grandparents had to be invited.