Idioms of imagination in English

leave nothing/little to the imagination

to allow more of somebody’s body to be seen than usual

Her tight-fitting dress left nothing to the imagination.

not by any stretch of the imagination | by no stretch of the imagination

used to say strongly that something is not true, even if you try to imagine or believe it

She could not, by any stretch of the imagination, be called beautiful.

By no stretch of the imagination could the trip be described as relaxing.