The bodice and skirt supports can be made using the patterns mentioned below. The neckline insert is very similar to a partlet, and here it looks like it is sewn to the neckline of the bodice. This 'partlet' insert is then used to support the shoulder decorations and sleeves, both of which you'd have to drape and pattern yourself. The skirt can be made using Simplicity 3637, except you'd need to alter it so that it was one piece across the front.
The bodice shown above could be used, with the boning providing the support needed so you don't need a corset underneath.
|Simplicity 3635, out of print|
The skirt will need a support similar to Simplicity 3635. Old copies of this pattern can still be found. otherwise look for patterns from Mantua Maker.
|Simplicity 3637, out of print|