Scarlet --
I am always on the hunt, that's for sure! Streamlined silk nightgowns can double as slips, too.
I'm not sure if you're looking in the US, but I'd check online bra/lingerie shops if so.
I have my eyes on WinterSilks, Peruvian Connection (~$40 for a full silk one, I'd have to cut out the shelf bra), plus the HerRoom/Bare Necessities sites. I know that Calvin Klein and Commando both have very minimalist, sleeker styles in synthetics but I've yet to buy.
Two of my plain edge, nicely "straight" neckline'd ones are ancient (12 years old) and came as underlayers for sheer dresses -- one's silk, one's a mysterious blend. Obviously that's no help, but FWIW while the silk feels better the other gets the job done without overheating me.
I've found others locally -- some new, some vintage. One of the newer ones is stretch silk...and I must confess that I've worn it backwards to get the "straight" neckline with no one *apparently* the wiser, so shhhhhhh (see attached).
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