Thursday 24 September marks a milestone in the brand's history: starting with the AH26 collection, SIXSŒURS is switching to fully natural fibres on its jackets and coats. Wool, alpaca, cashmere. No compromise — or almost none.

This is not a marketing stunt. It's the natural continuation of a standard that has existed since day one: style, and the properties of materials — the feel, the warmth, the strength, the hold — which directly affect how a garment is made, and therefore how durable, more resistant, and obviously less polluting it is. A fair return across the whole value chain.

And then there's what it brings us. When you're passionate, immersing yourself in the properties of fibres, weaves and finishes is a real pleasure. A form of fulfilment we don't find anywhere else.

This shift didn't happen as an afterthought, swapping one material for another on already-designed models. It guided the very design of several pieces in the collection.

The Tanita is the clearest example: seeking out a double-face wool wasn't a technical detail, it was the very condition of the piece — a wool fabric where pure wool takes on its fullest meaning, where the material literally shapes the cut.

The James caban tells the same story differently. It's no accident that this piece is symbolically tied to wool: its style rests on the hold and resilience specific to this fibre, and its enveloping silhouette follows directly from wool's insulating power and warmth. Wool doesn't dress the caban — it makes it possible.

Synthetics keep growing in the industry. Polyester now accounts for 59% of global fibre production — rising every year. Even luxury is giving in to it.

An obvious fact we easily forget: every synthetic fibre is crude oil. It doesn't grow on a sheep, or in a field — except, perhaps, an oil field.

The impacts are documented: according to the IUCN, 35% of primary microplastics released into the oceans come from synthetic textiles. A synthetic fibre doesn't solve the equation — quite the opposite, since a recycled fibre releases roughly 1.5 times more nano- and microplastics than a virgin one. We're careful here to avoid any black-and-white thinking: this isn't about claiming zero synthetics is possible, nor about giving up by saying it's impossible. Less synthetic means less oil, and therefore far fewer carbon emissions.

That's why, at SIXSŒURS, faced with long labels full of handsome logos, we prefer the ones that simply say "pure wool".