Overview
- A family statement said Costelloe died peacefully in London on 22 November, surrounded by his wife and seven children.
- The Dublin-born designer trained at the Grafton Academy and worked in Milan, Paris, New York and London before launching his label in 1979.
- He served as personal designer to Diana, Princess of Wales, from 1983 until her death in 1997.
- Costelloe showed at London Fashion Week for more than 35 years, led his brand’s design team into 2025, and took part in Ireland Fashion Week in October.
- His label sells across multiple categories, features long-running collaborations such as with Dunnes Stores, and continues operations following his death.