(The author of this post, Paddy Kelleher, has graciously allowed me to post this tutorial which is fantastic.  Thank you, Paddy!)
For this embroidery I consulted the talented Summerset. She uses a lot of lattice in her wearable art pieces so I asked for some advice, which she graciously provided.
Lattice satin stitch all-over embroidery
The pattern is on left. On the right is a tracing on reverse on right. Again I have used a satin fused with cotton interfacing for the base, with the upper fabric in a cotton velvet. The darts are marked on the bodice and thread traced through all layers.

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I sewed on the pink applique at neckline to have an end point for the embroidery. Sometimes you end up with a gap otherwise. The straight stitching lines follow the grid. This stablizes the layers and shows where to stitch.

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Keeping the line straight to do the stitching was a challenge for me. I wanted to stitch at an angle. I also found it better to stitch over the straight line with the line being just covered at one side by the stitching. If I tried to centre it I got crooked.

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I did not go through the dart area because I wanted to do as much as possible in the flat. I left one square blank on the side of the dart and then finished the stitching once the darts were sewn.  The stitching in flat nearly completed. I kept missing areas and would have to go back to them.
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The darts are sewn, the fused satin was trimmed away and the dart was catchstitched open.
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Dart is sewn and the gap in embroideryshows. It looks like my lines match up-Yay!
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Stitching complete, but the bodice hasn’t been trimmed to size yet. This dress is still in production, so I will get some pictures up once it has been completed.
ETA: Here is the completed dress…beautiful, Paddy!