I don’t know what the finished dress will look like, but the inside workings look like this. This is the foundation of the dress, which will be between the dress fabric and the lining. Right now I think the dress will be strapless. This foundation is made of interfacing, specifically a medium-weight woven non-fusible interfacing sandwiched between fusible weft interfacing. I block fused the interfacings first, then cut the bodice pieces from the interfacing. The seams are lapped seams, stitched using a zigzag stitch, and then trimmed. However, I left the under layer at the side seams the full width of the seam allowance. This will allow the dress to be altered to a larger size. The seam allowances at the foundation’s center back, upper edge and waist were cut away and the extensions that are cut from organza will be caught in the seams of the dress during constructions. I used 1/2″ wide rigilene boning to support the bodice.
Time to decide on fabrics.