Design duo Laetitia de Allegri and Matteo Fogale have installed window displays in four different COS stores to coincide with fashion weeks in London, Paris, Milan and New York (+ slideshow).

The London-based pair worked with the fashion brand COS to create the installations, which feature objects from their ISH collection made from stone-like materials called denimite and marblus.

"The installations display key denim and denimite elements from the COS Spring Summer 2016 collections suspended from Laetitia and Matteo's curved metal, denimite and marblus structures," said COS.

Denimite is made by fixing compressed denim fibres in resin, while marblus is formed in the same way using scraps of white cotton. Both are lightweight and durable.

De Allegri Fogale's work with materials influenced the COS menswear and womenswear garments this season.

"Laetitia and Matteo's work was part of the inspiration behind the COS Spring Summer 2016 collections, through a reworked take on classic renowned design," said the brand. "The windows acknowledge how denim – a classic and iconic material – has been recreated into new functions, especially encouraging the use of recycled and sustainable materials."

The first to open was the display at COS's Spring Street store in New York, on 8 February 2016. In the window, a black metal arch anchored by two brass cylinders is used to showcase a pair of denim dungarees.

A table with a denimite surface and marblus legs provides a podium for shoes.

On London's Regent Street, a similarly minimal installation includes a thin metal stand that curves up and over to hold a denim dress.

A ball on the end of the black element provides a hook for the garment's shoulder, while a bronze-coloured base helps with balance.

Shoes are presented on a small denimite stand, while marblus shelves slotted onto a vertical semi-circle display accessories.

As a backdrop, geometric panels covered in soft blue fabrics stand against white partitions.

The duo's design for Milan's Corso Vercelli COS store opened on 22 February 2016, and the final window was unveiled in Paris a week later.

"The windows illustrate how both COS and the design worlds interpret materials differently through their own unique disciplines; both creating clean, modern and timeless results," COS said.

De Allegri and Fogale set up their studio together after working on other individual and collaborative projects. De Allegri worked with Eva Feldkamp to create a collection of furniture and products, while Fogale teamed up with Joscha Brose to create a valet stand, dresser and set of mirrors.

As a duo, they created a tinted acrylic tunnel at the V&A museum for London Design Festival 2015.

COS frequently works with architects and designers to create temporary stores, installations and furniture pieces. Previous collaborators include Nendo, André Fu and Snarkitecture, while Sou Fujimoto is creating a spotlight installation for the brand during Milan design week 2016.

Till Wiedeck designed multi-level display stands for COS in 2014, and the brand teamed up with Hay and Tomas Alonso to produce a pair of tables last year.

In an interview with Dezeen, managing director Marie Honda said that "design and architecture has been a key influence" to the fashion brand, which is part of the Swedish H&M group.