WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Upholstery Catches On Bottom Edge
Courtesy of VOLVO CARS OF NORTH AMERICA.
Remove backrest from seat.
Release the upholstery catches on the bottom edge.
Start to pull off upholstery.
Then remove the clamps between upholstery and padding.