Tailoring forms the backbone of this season, softened by linen, silk and lightweight cotton, creating a wardrobe that transitions from day to evening and from spring into high summer. Creative Director William Costelloe explains “I wanted this collection to feel chic, effortless and spontaneous. The design and the fabric should do the work — a beautiful garment, a great bag, a silk scarf worn however you want. No rules.”

Structured biker jackets, cropped silhouettes and statement coats in 100% Italian textured wools open the collection, while oversized single and double-breasted jackets feature wide, curved lapels, sculpted shoulders and exaggerated proportions. High-buttoned jackets are fastened with specially moulded gold buttons which bear the Costelloe family crestand motto Cor Unum, Via Una — One Heart, One Way.  Oversized single and double-breasted jackets in Magee striped linens are complemented by coordinating shorts and longer, wide-leg pleated trousers, bringing a relaxed ease to the season’s tailoring. Thin double-layered belts in tonal navy and tan define the waist and provide structure to the collection’s fluidity. 

Silk scarves play a defining role throughout the collection. Hand-drawn by William Costelloe, the prints are framed by bold statement borders and styled with an instinctive sense of ease — worn as headscarves, loosely around the neck or wrapped and tied around handbags. 

Crisp blue and white shirting provides a lighter counterpoint, with oversized curved cuffs, statement bows and pleated linen shapes.  The palette remains deliberately concise in navy, cornflower blue, cream, white and soft summer neutrals, allowing cut and fabrication to take centre stage.  Paul Costelloe bags include oversized clutches, raffia totes and east-west bags in tan and navy

Towards the finale, William celebrates Irish textiles, with fabrics from Ferguson’s Irish Linen and Magee presented in fluid jumpsuits, sculpted dresses, voluminous shorts and summer tailoring. Signature floral details appear alongside textured linen blends and relaxed silhouettes. 

Credits:

PR – The Lifestyle Agency

Jewellery by Samanth Siu

Photographs provided by Daniel Sims and provided by The Lifestyle Agency