A "simple outline" is a basic and uncomplicated summary or plan that helps organize information or ideas. It is like a skeleton or framework that provides a general structure without going into too much detail. Full definition
Some of his celebrity portraits were first «under - painted» by tracing simple outlines of the photographic image onto the canvas and painted in blocks of color. (warhol.org)
The design has an overall simple outline with little decoration. (dresshead.com)
You can write a very simple outline: list all of the ideas you want to cover in your analytical essay and decide on the sequence of their presentation. (custom-essay.ws)