I wash my wool shirt in the machine with lots of fabric softener on the gentle cycle, then line dry and stretch it as it dries.
I received this 1899 photo from Dutch Al.

That is an interesting mix of uniforms! A lot of British 1896, some US 1899 but also a couple of 5 button tunics with lower pockets on them. The Brits also did blouse/tunic with lower pockets only on it. I wonder if those are from the Brits also.