Here is a way you can make your own leather flak vest to hold your armour on. Use an old leather jacket, make sure it fits by wearing it backwards and having someone zip you up. If it is a tight fit then you can use it as a flak vest. Simply cut the sleeves off (keep some of the sleeve for attachment of your shoulder bells). Then attach armour using tape for spacing. Next you would form your armour with a heat gun, prime, metallic coat, paint, and weather before attaching velcro.