I'm not clear on how to count PPI on this weave structure. I'm working on the first towel and tried a weave with a total of 15 threads per inch, counting both pattern and tabby threads, which is very open. So I rewatched the video at the loom, where Jane was going over the project specs and she said something like "trying for 15 tabby and 15 pattern", so if the spec is 15 PPI, does that mean that one inch actually contains 30 threads: 15 pattern and 15 tabby?
Exactly. I usually just count the tabby threads, which in this case should be 15 ppi.
Thank you for the help. I did notice that Jane said that the sett for the towels would be different with changing treadling, but it looked like towel 1 could be expected to have a sett of 15, which would give me a hint of how the fabric should feel for the others?