When a boy first joins Cub Scouting, his uniform will display only those badges that identify his status.
As he progresses, the Cub Scout will earn badges, pins, medals, and other insignia that tell of his accomplishments in Scouting. These items should be added to the uniform only after they have been earned.
How to Attach Patches
You have 2 options for attaching patches to the Cub Scout uniform.
Purchase a page of Badge Magic from the Scout Shop and iron on the insignia.
Here's some instructional videos on how to attach and un-attach badges with Badge Magic.
Either use supplies that you have on hand or purchase a sewing kit from the Scout Shop.
Here's a quick how-to on sewing Cub Scout patches.