What is the correct size of skill badges that are worn with mini-medal sets (Not in uniform but with civilian attire like a suit)?

As a retiree I am authorized to wear the mini medals with my suit, as long as there are worn correctly, I also carry my last rip to show I am authorized to wear my decorations, don't want someone yelling stolen valor.

Veterans need to tell their story so someone else doesn't fill the void with their BS. You wouldn't wear it to the supermarket or on a tshirt while your cutting the lawn. You certainly don't have to, but if you want to at the appropriate time/place, here's how. Each service prescribes wear IAW the law. Here is the excerpt from AR670-1, which mirrors the federal statute 10-USC 772.

Retired personnel and former members of the Army (as described above) may wear all categories of medals described in this regulation on appropriate civilian clothing. This includes clothes designed for veteran and patriotic organizations on Veteran’s Day, Memorial Day, and Armed Forces Day, as well as at formal occasions of ceremony and social functions of a military nature. Personnel may wear either full-sized or miniature medals. Personnel who wear medals on civilian clothes should place the medals on the clothing in approximately the same location and in the same manner as for the Army uniform, so they look similar to medals worn on the Army uniform.