Popular coat’s appearance on cover of Lily Allen’s West End Girl album underlines how ubiquitous style has become

If West End Girl, Lily Allen’s first album for seven years, which details the breakdown of her relationship has occupied the minds of music critics and marriage counsellors, fashion watchers have spotted something different.

The puffer jacket Allen is wearing on the cover is not just a pop of colour in what may become an iconic album cover, it is also a sign of the times – underlining just how ubiquitous this jacket shape has become as winter arrives each year.

With a rise in people opting for non-monogamy, experts suggest the idea of the traditional couple is radically changing

“We had an arrangement, be discreet and don’t be blatant. There had to be payment, it had to be with strangers,” sings Lily Allen in her surprisingly candid and detailed album thought to be about her open relationship with her ex-husband.

The album has catapulted the concept of non-monogamous relationships into the spotlight, and couples therapists report that an increasing number of their clients are choosing to go down this route.