A vehicle seat assembly is provided having a seat frame and a foam cushion supported on the seat frame. An airbag module is positioned in an opening formed in the foam cushion. A trim cover assembly covering the foam cushion and airbag module has an interlay material sewn to a trim panel at an interlay seam. The interlay material extends from the interlay seam to cover an outboard surface of the airbag module inside the trim panel to ensure the airbag module is not visible through the trim panel.