The present invention provides an adapter apparatus and method for attaching a holster having at least one belt loop to a surface of another article. The adapter includes a flexible sheet having first and second surfaces. The sheet also has a longitudinally extending central panel with opposite ends. The width of the central panel is sized to pass through a holster belt loop. There is an end panel at each end of the central panel. The end panels have a transverse width greater than the width of the central panel. There are fastener components on the second surface corresponding to a complementary fastener component on a surface of another article. At least one end panel is foldable to a width for passage through the belt loop and then unfolded such that the fastener components will secure the sheet and holster to the surface of the other article.