HY should be adding some of their fall/winter line in not too long. They have an affiliate thread. I don't know how low a rise you want, but their trousers made in Italy have a lower rise than their trousers made in the US, just so you know. The sizing charts have more detail.
I believe Epaulet will also have some flannel, possibly even in their "rivet chino" fit, which has a lower rise than their Walt or Rudy.