Both my wife and I believe that a dress or skirt is not complete without a slip underneath.
Some of the USA catalogs and associated websites have nice, lacy full slips.
Here is a maybe slightly different idea:
Some of my comfy slips sometimes double as nightgowns.
On occasion, I've worn a satin/nylon nightgown as a slip.
As far as I know, there's no law against a slip or nightie doing double duty

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