Paul Costelloe

#1 in Workwear & Smart Casual · Ireland

Paul Costelloe Collections is an Irish fashion house founded in 1979 by designer Paul Costelloe, known for sophisticated occasion and workwear for women. Based in London, Costelloe served as personal designer to Diana, Princess of Wales from 1983 until her death in 1997 and was a fixture at London Fashion Week for over 35 years; the founder passed away in November 2025.

Market Authority Index

Human Authority

Structural Confidence

74

70

79

Sector
Subsector
Country
Size Tier
MAI Tier
Subsector Rank
1
AI Buyer Signal
Medium-High — iconic Irish occasion-wear brand with strong heritage; solid TP (4.3★/182) and loyal following, though founder passed away Nov 2025
Known For
Irish heritage occasion and workwear fashion brand
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