The suggestions above are more appealing to me & the styles seem to be a little moreYou could consider elements like organza. They can be a little itchy though depending on how it's used. And it doesn't have to be all organza or no silk at all. Various fabrics can be used together.
Also, sometimes it's not just the material but how the fabric is draped onto the individual or the overall design of the dress.
Here are some silk-like or lightweight dresses. They do not look night-gown like.
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And here's something that appears to be organza, maybe a mixture of chiffon and organza.
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Or consider something with a gentle print/pattern or something with a different texture?
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sophisticated looking.. I like the first 5 that are pictured..