A Love Story

Writing the girl almost exclusively from John's perspective reminds me of Vladimir Nabokov's exposition of Lolita: Outside the maniacal gaze of Humbert there is no nymphet - outside the loving (and sometimes maniacal) gaze of John there is no Brigitte Bardot.

Indeed it is Paul, who likens the girl's appearance to Brigitte Bardot first when he and John notice her at the chip shop near Sefton Park but that's more likely to get John's attention and his approval to ask the girl out. Still, Paul finds her quite attractive and if John hadn't talked Paul out of it, maybe the story would've played out very differently.
Margaret, the Cavernite, seems to be a bit intimidated by the girl but deems her very pretty despite being disappointed to learn that John has a girlfriend.
George immediatley strikes up a close friendship with the girl and occasionally remarks that he'd like a girlfriend just like her, not because of her looks but because George thinks of her as a loyal, understanding partner and her relationship with John as sort of cool and mature (and obviously sexual).
The only impartial observer is Bertie, the Cambridge Hall barmaid, who doesn't recognise any resemblence with Brigitte Bardot at all when John proudly shows her a photo of the girl. Her verdict: Well, she's a blonde and certainly a beauty.

So, how does she look like then?

perfume

The girl's signature scent is patchouli - lots of it. She surely is ahead of time, since patchouli - and the incense she seems to burn quite often - became wildly popular only in the late 60s. And yet John miraculously found a bottle of patchouli oil whilst holidaying with Paul in Paris, which he gave the girl alongside a black beret. Patchouli blends wonderfully with other deep, amber notes like musk and French labdanum, so the girl's perfume is a quite heady, sensuous love potion. John loves it, he doesn't even mind that his clothes and bedsheets smell of the girl for days.
The girl would've loved Alysssa Ashley's Essence de Patchouli, which sadly wasn't invented yet, so instead she oftentimes wears Estée Lauder's Youth-Dew or the more budget friendly Desert Flower. Tosca is right up the girl's alley too but because it's been around since 1921, it's her mother's (and grandmother's) go-to perfume and she rather have a distinctive scent of her own.

Another potent aphrodisiac for John is Paul's (and his) Old Spice soap, not only on Paul but on the girl as well. More than once it reminds John of the good times when just the three of them were together.

Whilst visiting John for the first time in Hamburg, the girl discovers the brand new launched Nonchalance and convinces John to use Tabac from now on, which he can be seen still using in January '64 during The Beatles' stay in Paris.

In '66 the iconic Eau Sauvage is launched and the girl immediately gives John a bottle of it as a present; the combination of musk, amber, sandalwood and patchouli is what she's always been waiting for.

I'm a huge (vintage) perfume aficionado, so writing about the girl's patchouli scents is the most self-indulgent part of my story because I haven't found the perfect one for myself yet. I do know and partly own all the perfumes I write about and I love them all despite many people consider them old-fashioned granny scents.

The real John Lennon indeed used Old Spice, Tabac and Eau Sauvage and I think it's pretty cool to be able to get an idea of how he actually smelled like...

Cynhtia Lennon revealed in an interview that the first perfume John bought her was Je Reviens which funnily enough has incense as a base note and during their honeymoon in Paris, John bought her Chanel No.5, which coincidentally many people feel is similar to Nonchalance.

Pattie Boyd's favourite perfume, as I found out during research, during the 60s was Guerlain's Jicky which is almost the exact opposite of scents the girl prefers.