I've been struggling with the period correct dress versus state hunter orange law dilemma for a long time. I have seen hunter orange waistcoats (often winds up an under layer in cold weather) for early squirrel season I dyed a white period shirt "safety orange" (did not come out as bright fluorescent as the law might like, and same issue in cold weather), an orange "liberty cap" or, if you know someone who knits, an orange Monmouth cap is an option. I also had One Blanket Traders make me a hunting frock or rifleman's shirt with an orange cape.
However I recently came upon my personal best solution yet, for colder weather....
A wool hunter orange "match coat" to go over whatever period dress I happen to be wearing....
The difficulty was getting a few yards of hunter orange wool material. Johnson Woolen Mills lists it, but hasn't had it in stock for almost a year. I was lucky and got a manufacturer to part with 2 yards of their material, they are not interested in making a habit of this.
In fact, I have had a lot of trouble finding
any hunter orange fabric that isn't synthetic.
I washed the 2 yards in warm water at high agitation and dried it hot to "full" it. Cut it to a length good for me and bound the cut ends with brown wool tape (not totally needed but helps make orientation easy in the dark. I have been out in pouring, cold, rain with it as its 1st test, it kept my upper body and most of my legs, as well as my lock, shot pouch and horn, all warm and dry.