My guess is that the kilt was made by someone that Tartan Web contracts with - rather than a Tartan Web employee - correct me if I'm wrong.

The key fault seems to be lack of oversight - whether making standards clear to the contract kiltmaker or INSPECTING the kilt for defects before shipping it out to the customer. Basic quality control is expected by the customer.

Dealing direct with a kiltmaker - preferrably a kiltmaker who puts THEIR name on their garments, rather than a middleman, would likely eliminate much of the risk for such errors.