We are committed to slow fashion and sustainable design. Transparency, sustainability and social well-being is at the core of our business.” – Agata Natalia Kozak

100% designed in United Kingdom. Produced in family-run factories in Portugal. Visit COSSAC.

(€ = budget | €€ = mid | €€€ = premium | €€€€ = luxe) (★★★★★ = heirloom + zero-waste preorder |

The fashion industry drives massive waste, but COSSAC counters it with enduring minimalist womenswear. Designed in London for versatile wardrobes that last. Every piece prioritizes ethics over trends.

Brand Intro

COSSAC launched in 2014 by Agata Natalia Kozak in London, blending her Polish roots and European fashion experience. Designs originate in the UK; production occurs in small, family-run GOTS-certified factories in Portugal like those in Penafiel and Guimaraes. This ensures fair wages, low emissions, and quality control.

Inspiring Story

Founder Agata Kozak prototyped her first collections after years in high-street labels, testing for durability in real life. One pivotal moment: refining a wrap dress over seasons to perfect its timeless fit, born from frustration with disposable trends. Today, it embodies her vision of clothing that empowers women through conscious, versatile style.

Who is this for?

You build capsule wardrobes that mix work and weekends, valuing pieces that age gracefully. You prioritize ethics in your closet, seeking organic fabrics and transparent supply chains over fleeting hype. You appreciate European craft that supports local artisans without excess.

DISCLAIMER Sustainability score is subjective. InEurope.eu finds this crucial, but conducts no audits. Assessment based on publicly available information and brand feedback