Altering open-backed dresses?

I don’t know about altering, but you could add a bolero jacket or something to adjust it.

You could consider adding draped material across from one side to the other. This does not have to add any structure to the dress but just adding covering over the back.

You could ask a seamstress to cover the back! You'd need to buy extra fabric from the dress designer to guarantee that it matches and looks intentional, and it probably won't be cheap, but it can be done. You could also try to special order the dress with a covered back. My dress had an open back originally, and I had it altered to be covered up. Here's the original dress style (this is the photo from the designer's website):




And here's how it turned out (photo from my wedding day):

Congratulations on your engagement, and happy wedding planning!

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Oh wow! Your dress is so pretty! What a great idea for the back.

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So pretty. Looks much classier that way as well.