The shop will open on High Street - in the building formerly occupied by Clinton Cards - this Friday (July 29).
The walls will display work by local artist Angie Roberts.
The brand advertises itself as selling ‘timeless, stylish’ womenswear and opened its first shop in Hampsted in 1970.
From Friday to Sunday there will be a gift with every purchase including Jigsaw x Market Harborough canvas tote bags.