There are doubtless good AND not-so-good kilt-makers, on both sides of the Atlantic. There are many advantages to going local (or at least on the same continent, if you don't live close to a kilt-maker.) That being said, all is not doom and gloom for north americans who want their kilt made across the pond. Among the kilts I own are two wonderfully constructed kilts made by Balmoral, and sold through Scotweb. I did have my local tailor take my measurements, to ensure they were accurate (with a hardcopy of Scotweb's instructions for measuring in hand, to ensure the measurements were taken correctly.) I opted for those particular kilts to be "scottish made", and I am very pleased with the results.

Go with whatever makes you most comfortable... a local or an overseas maker... but take your time and do your research either way. Talk to other kilt wearers, and solicit the opinions of those on here who own kilts made by makers you are considering.