My DGDs have been Brownies and are now Guides. All their badges have been sown on to fleece blankets (with all their other badges for swimming, gymnastics badges gained over the years). The girls choose the positioning and I just machine them (I find stitching through the badges impossible by hand). The blankets are getting very crowded now but more will be coming shortly.
I did the same for my DDs badges, although hers were on her uniform till she moved up through brownies, guides, scouts, ventures. Today, it seems some groups display their badges on uniforms, while others choose not too! All mine from the 50/60s are in my memory box somewhere.