Use Printable Heat Transfer for light fabrics on lighter fabric surfaces. Print an image and cut out around the contour using the Silhouette cutting machine's Print & Cut feature. You can then iron your custom image onto a fabric surface, such as a t-shirt.

This material turns semi-transparent when ironed and should only be used on white or very light fabrics. 

Videos:

Watch the Heat Print LT3T Video How to Print & Cut (FAQ/videos)
How to use Printable Heat Transfer for Light Fabrics