How do you go about it as a potential mill customer?

[bookish]

Have you talked to anyone at Andrew Elliot Ltd. or Prickly Thistle?

Early in my research, I had messaged Clare of Prickly Thistle about the Climate Stripes tartan, but not about a custom weaving. I like the messaging and branding of Prickly Thistle. I have not looked into Andrew Elliot Ltd. Thank you for the suggestions!