When Bella Freud thinks of a moment that helped consolidate her style, a photograph of her father, the artist Lucian Freud, aged 15, standing alongside her great-grandfather, the “father of psychoanalysis” Sigmund Freud, comes to mind. Both are a strict sartorial vision in their constrictive tailoring. “They’re not dressed for a special occasion, just in this stuff — and it looks so good,” she says, grinning from her study, dressed herself in a punkish, loose-knit black jumper and fully buttoned white shirt.