300polygons

I really want to make a change to the Cobalt Debonair Ensemble for the female body type. If you click here, you can see the cameo bit looks unfinished, but on the Rose Riding Attire, there's a flower cameo (it is also visible on the Brown Riding Attire). I'd love to add a cameo to the CDE, but I'm not experienced or educated in how to go about doing so. I imagine I'd either take the texture from the rose or brown riding attire and just plaster it on do the cobalt debonair outfit, but adding a more customized one might be fun as well. Can anyone help me in doing this? I'm not sure what programs I need to do this, and google wasn't much help in explaining how to create a mod such as this one as well. This is probably the wrong place to ask, but I figured I'd give it a try.