If this isn't restricted to the USA, Queen's Regulations - and I'd guess that therefore it's the same for Australia, Canada, and NZ - only allow the wearing of miniatures with full evening dress and mess dress. So, one could wear them, I suppose, with whatever would count as full evening dress with the kilt (I would imagine that would mean fly plaid and the rest of the gear). The only acceptable mess kit with the kilt would be if one were serving with a kilted unit. Otherwise, one has to wear the medals themselves, preferably court mounted, as is required with dinner jacket or lounge suit.