Get a new glamorous dress for your runtime. Empire Elegance comes with five textures and a lot of morphs and little helpers for you to make it as easy as possible to fit the dress to any character.
To help make it easy to fit the dress to the sitting and kneeling poses, Empire Elegance has these built in. The morph only effects the skirt so you can use any pose you want for the upper body. Apply your pose first and then apply the kneeling or sitting morph.