Paul Costelloe SS27 opened London Fashion Week on 17 September 2026 with a deliberate return to the house’s Diana-era vocabulary—and a quiet insistence that William Costelloe is editing that vocabulary for himself. According to The Irish Times and TheIndustry.fashion, this is William’s second collection as creative director after Paul’s death last year, staged not at the Waldorf Hilton after fifteen years but at Banking Hall near Liverpool Street. Shoulder pads, pussy-bow shirts, silk headscarves, and oversized clutches flooded the runway in a stubbornly restrained palette of navy, cream, and white, with sky-blue smatterings and butter-yellow flashes arriving later. For Cover Issue’s runway desk, Paul Costelloe SS27 sits beside Featured Mulberry at Three as the week’s clearest argument that heritage houses can open LFW without repeating themselves note for note.
The brief is inheritance under pressure. Paul Costelloe was appointed personal designer to Diana, Princess of Wales, in 1983; broad shoulders, pussy bows, and big-buttoned tailoring remain fused to the name. William’s February debut proved the house could continue. His second outing, both outlets report, looks familiar—and slightly filtered through his own eye.
Diana-era shoulders, pussy bows, and Banking Hall
The Irish Times frames the Eighties reach as almost inevitable territory. William flooded the runway with exaggerated shoulders, pussy-bow shirts, and silk headscarves, then added modern oversized clutches and a nautical navy-and-white spine. TheIndustry.fashion notes the same accents and stresses that print was noticeably scarce: where his father often let colour and print command attention, William two collections in seems more interested in shape, cut, and fabrication. Tailoring formed the backbone, softened by linen, silk, and lightweight cotton—a wardrobe that moves from day to evening and spring to high summer without needing a printed alibi.
The venue change is part of the thesis. After fifteen years at the Waldorf, Banking Hall’s marble east-London formality replaces hotel-ballroom habit. Family stayed close: Jessica Costelloe on the door; Mollie King and Roxy Horner front row in head-to-toe Paul Costelloe autumn/winter 2026. The show opened with Nicholas Costelloe’s hand-drawn fox animation—an homage to Paul travelling through the house’s materials—setting up the hand-drawn scarves that recurred through the looks. In a week thick with generative-image chatter, the analogue fox lands as craft first.
No rules: design and fabric do the work
Before the show, William told reporters: “The design and the fabric should do the work… a beautiful garment, a great bag, a silk scarf worn however you want. No rules.” That quote, carried by both The Irish Times and TheIndustry.fashion, is the season’s usable manifesto. It also explains the styling shifts both outlets flag: blazers thrown over swimsuits, bralettes under outerwear, flowing culottes and bubble-hemmed capris, then knitted and tailored hot pants continuing the abbreviated-trouser obsession. The pussy bow and shoulder pads still speak Diana; the balloon capris and knitted hot pants do not.
Restraint is the risk and the point. A restricted navy-cream-white grid can make spontaneity feel cautious when experiments stack too thickly. The strongest looks, The Irish Times notes, were those where William resisted doing too much—an oversized jacket with bulbous buttons, or broad Eighties shoulders paired with a modern trouser. That tension between restraint and exaggeration is the Paul Costelloe SS27 story searchers should carry: not costume Diana, but Diana-era architecture edited for shape.
Ferguson’s Irish Linen, Magee, and Dolly’s finale
Final looks celebrated Irish roots through Ferguson’s Irish Linen and Magee fabrics across appliqué floral dresses, shorts, and blazers—both outlets name the mills. Then Dolly Parton’s “Here You Come Again” played for the finale, another LFW nod to the late country singer after Vin + Omi earlier in the month. The soundtrack bridge matters for culture readers tracking how London’s week keeps folding country homage into runway ritual; for Costelloe specifically, it softens the Banking Hall marble with something human-scale after the fox animation’s craft overture.
Cross-file the Irish-linen closer against Maximilian Raynor’s village-green maximalism and Harris Reed’s Loud Whispers: different volumes, same London appetite for narrative openings that tell you who the house is before the first look clears the corner.
How to wear Paul Costelloe SS27 off-runway
One Diana-era shoulder: pick a structured blazer or padded silhouette; do not stack every Eighties cue at once.
Pussy bow or silk scarf—not both at equal volume: William’s “no rules” still rewards a single hero accessory.
Navy, cream, white first: add sky blue or butter yellow as a flash, not a flood—print is scarce for a reason.
Bubble-hem capris or hot pants as the modern footnote: that is William’s distance from his father’s Costelloe.
Stay sourced: attribute Banking Hall, the fox animation, Ferguson’s and Magee, and the Dolly finale to The Irish Times and TheIndustry.fashion.
Where Paul Costelloe SS27 sits in the LFW grid
London’s SS27 openers have ranged from Kane-era Mulberry storytelling to village-green sporting feuds. Paul Costelloe SS27 adds Diana-era power dressing edited through William’s shape obsession—Banking Hall instead of Waldorf, scarce print, balloon capris that are his own. Search language: Paul Costelloe SS27, William Costelloe LFW, Diana-era shoulders, pussy-bow shirts, Banking Hall Liverpool Street, Ferguson’s Irish Linen Magee, Here You Come Again finale. Package the navy silk scarf, the oversized buttons, and the shoulder-pad silhouette—then let the quote do the rest: design and fabric should do the work. No rules.
One foot in Diana’s Eighties, one foot in balloon hems. Paul Costelloe SS27 proves the house can open London Fashion Week without becoming a museum—and without pretending the founder’s vocabulary was never the point.