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Some shops on eBay will make you a dress to fit if you give them your measurements.
The other thing I would suggest is to buy a simple size 16 dress, and take it in round the waist and hips yourself.
This does mean investing in a sewing machine and an instructional book.
However, in the long run, it’ll mean you can wear a wider range.
I am an odd shape.
I taught myself sewing.
it’s very useful.
Reader’s Digest does a phenomenally good book on sewing.