Slinger

[M. Demetrius]

Probably either one would be about the right weight for a tunic. If it's "jacket weight", it's generally good enough. You still ought to get with whomever you plan to associate and make sure they agree on the fabric color. You'll notice the diagonal "stripes" in the gabardine selection. That's a function of the way the fabric is woven, basically the same weave as denim blue jeans. They were able to weave cloth that way in the early years. I am not totally sure exactly when the 4 heddle loom came into use (needful for herringbone, gabardine and other twills), but if your chosen era is anywhere near the first century, you're good with it.

Flannel, on the other hand, is softer, but tends to thicken up on first washing and become much less "drapey". That is, it is much stiffer, and will not make the nice curved wrinkles you see in the sculptures. It is pretty dense and warm, (outside of your group's veto) so better for cooler weather. Flannel is woven, but has some of the characteristics of felt. It would make a better sagum/paenula than a tunic if it's very thick. Chances are it will not be a first choice for a first tunic.