This Dress is d-Force compatible and can be simply used by hitting the Simulate button in the Simulation Settings pane.
The set contains a Bra, a Panty and a Dress. It is specially made to be able to use the Panty and Bra below the Dress. The geometry and simulation parameters are set so that most of the poses you can apply will work with the default settings. In some case if difficult posing are used it can happen that the underwear are poking over the Dress. If this happens there are some different simulation settings available. By default, the Dress is in SimpleUnderwear setting but there is also a DifficultUnderwear and a NoUnderwear setting available in the Simulation Folder. Using those settings will make the border of the Skirt a little bigger if DifficultUnderwear is chosen. In contrary they will look very natural and small if NoUnderwear is applied.