They are Tommy Bahama fabrics. I contacted Airstream Customer Service with this exact question. Here is their response:
The TB fabrics come from Sunbury Textiles, but it’s much easier to order through our soft goods fabricator, Top Stitch. Alan Walker is our rep there and is wonderful to work with. He would be more than happy to help our customer out and is aware that they may be reaching out soon. He can be reached at
awalker@topstitch-inc.com.
I have been in touch with Alan and he was very helpful but I ended up not ordering the fabric just yet because our opinions on decor choices seem to change every five minutes. BTW the striped fabric is $43.50 per yard.