SO MANY of the kilts over here are ordered from domestic companies, that "piece-out" the kilts to overseas. Others are ordered and bought there directly. Then there are small shop kiltmakers that do GREAT work, but in small quantities that you'll never find out (like Highland Heritage). As for US companies, you would be best advised to contact them individually, and let them know what project you're working with. Getting an HONEST answer is FAR from guaranteed from a few however.

AmeriKilt, UtiliKilts, SportKilts, Buzz Kidder, CheapKilts, SavannahKilts, StillwaterKilts, NeoKilts, USAKilts, KingKilts, KiltMart, Thump Music, eBay vendors, and other "internet only" companies are just the tip of the ice berg! There are literally HUNDREDS of celtic shops and rental-sellers that are out there.

GOOD LUCK!!!