The brand is stretching in new directions under new owners, Four Holdings.
Brothers David and Mike Appel launched Related Garments in 2015, but now that bigger players have copied their matching socks and underwear concept, they are having to innovate quickly.
The London-based tights brand uses technology and product innovation to make comfortable shapewear.
French lingerie designer Chantal Thomass is leaving the brand she created in 1975, now owned by Groupe Chantelle.
The brand will launch with a pop-up in Topshop and is operating on a subscription-based model.