Ideations are quick concept sketches used in the entertainment business. In the fashion business they are called Croquis, or quick sketch in French.
Ideations and croquis are created either manually or digitally. They are usually created over a body template. It is much better to use the same pose or a straight front view pose for all the drawings. This way you are only looking at the garment designs and are not distracted by different poses and body types.
These ideations/croquis shown are both done using one template.
Below are two templates that you can download to make your own ideations/croquis templates. Note that seamlines are drawn on both templates to help with seam placement. These body templates are only slightly elongated to make them more suitable for a patternmaker to use.