Roman Standards

[Marcus Julius]

There is a group starting up your neck of the wood, also a XIIIIth Legion.

But as you say, it was an all male fighting machine. But for info for SCA there are quite a few sites and people on here who can help.

Matt Amt I think was SCA, and also Hibs bunch in California were SCA from what I see.
Plenty of advice for authenticity purposes on this forum for sure.

One of the problems with the SCA is it's narrowmindedness when it comes to heraldry. The SCA's heraldic rules are based on those of Britain, with any exceptions. While you are more than welcome to display items without it being "accepted" heraldry (as long as they aren't offensive), you'd be hard-pressed to get a true roman design approved as your personal banner. Though, I personally have registered one loosely based on 'unit' shields from the Notitia Dignitatum, and have also seen the ninth legion display a similar one. However, these designs are later Empire period.

I'm curious in the way of using them in reenactment purposes. It sounds like you would have to pick a Legion to associate yourself with and recreate their standard?

If you want to be an authentic reenactor, yes.
It's encouraging to see your interest in here. SCA has a bad reputation for not being authentic enough, but that's the difference between REENACTMENT (what was) and RECREATION (what could have been).