Here are some of my 1920s slips.
A mint green slip with gathers at the side hip.
An apple green slip with gathered skirt.
A pink satin slip which I’m wearing here with my 1920s pink satin dressing gown.
A pink rayon/viscose slip with circle skirt.
And an apricot rayon/viscose and lace teddy or step-in. Here’s a similar 1920s silk and lace teddy, and another similar teddy. Here’s a black-and-white photograph of a lace teddy, and a color photograph of three step-ins.