For more information about limitations on puffy garments, expand the following:
If quilting lines are spaced too close together,
Shells that are made out of multiple panels before they are quilted and filled require a different treatment in Lotta and VStitcher. This is because the puffy function treats pattern edges as quilting lines.
To replicate multi-panel shells, do the following in VStitcher:
Combine all the panels into a single pattern piece using merge.
Then apply the panel edges on the new single pattern piece as internal lines.
For more information on using the Merge tool, refer to Merging Pieces.