We ordered from Claymore's web presence, KiltRentalUSA, for the kilts for the men of our wedding party. As they were all travelling from Scotland and kilts way a TON, it was rather impractical to rent the tartan we wanted and have them carry over. Also, for the length of travel time, it would be insanely expensive. Enter kilts from Arizona! Who knew?
They provided not only the rental kilts for the men (of which all but one fit perfectly), but I also ordered a necktie and some tartan fabric ahead of time for a little girl's dress + accessory-making. The shipping on that order was exorbitant, but the kilt order was great and we had no complaints.
This place has a larger selection of tartans for rental kilts than anywhere in Central or Eastern Scotland (believe me, I looked in person!) and the pricing for the service is competitive with what we're used to paying in the UK. While my now-husband owns his own kilt, it was great to have the wedding party in a similar style and with the right tartan. Very good service!