1. Open the selected garment CAD software and create a new sketch.
2. Select the desired drawing tools, such as drawing lines, drawing circles, etc., to draw outlines and basic shapes.
3. Use editing tools to adjust and modify shapes, such as moving, rotating, and scaling.
4. Use fill and texture tools to add materials and patterns to make your designs more vivid and realistic.
5. Use the color and gradient tools to add color to your design for better preview and presentation later in the design process.
6. Save and export sketch files for further use in other designs or to share with team members.
It should be noted that when using apparel CAD software to make sketches, you should make sure that you have a full understanding and mastery of the various functions and tools of the software in order to better complete the design work.