I went to the site. There are a few things there that cause me to have reservations.

Of 11 oz. tartan they claim, "If you live in the warmer climates of the United States, this is the weight for you." I have worn 16 oz tartan in 90 degree weather with no discomfort. 11 oz/yard is really too light for a kilt.

They sell family coats or arms. "Completely Authentic and Accurate!
We have a collection of over 500,000 Coats of Arms associated with the most common surnames from many different nationalities, and we have access to resources that allow us to custom make Coats of Arms for just about any surname of European origin. These heraldically accurate Coats of Arms are presently available as full color 8 1/2 X 11 prints on white or parch-tone paper."

Of course, there are no such things. A coat of arms belongs to only one individual at a time, and a person can be crimally prosecuted in Scotland for displaying arms not his own. This sends off all sorts of red flags.

Finally, they advertise ladies' kilts. Perhaps it's a quibble, but ladies do not wear kilts. Men wear kilts. Ladies wear kilted skirts. Kilt merchants should know the difference.

Perhaps they retail good kilts. I don't know. But I would hesitate to rely on them for advice.