Looking at those pictures, the two sections in the middle look almost like they have the same length...
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So, I'll make what looks best on me. When I looks at these, the difference in width of the black sections looks more pronounced, here I'd guess 3cm for the narrow strips and 5cm for the wider ones - food for thought, a lot to play with
Here the white base fabric, again a cotton sateen
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I'll line the whole dress with Bemberg.