Well back to the armor!
I think we are talking about a "Tetsu sabiji nimai-dô gusoku" (russet iron two part-cuirass armor - simplifiyed naming!) with nunome-zogan adornment, might dating back to the latter half of the Edo period. The helmet is a so called "Hoshi-kabuto" (or Koboshi-kabuto)* of rather good quality. Unfortunately the provided pictures don't tell much about the whole. What I can say is that kote (sleeves) and suneate (shin guards) comming from a matching set, but it seems the haidate (apron) is missing.
This is also true for the dô (cuirass) and the kabuto (helmet)*. In case of the Jingasa (bajo-jingasa = riding hat) and the ogi (fan), however, we can't be sure...
Note, the dô is insofar interesting, that it was made to look like a rokumai-dô (six part cuirass)!
A word about the mon (coat of arms) that makes the helmet and the cuirass "matching". The example below is very close and probably related at least to 3 families, namely: 島村氏, 河村氏 and 茅野氏. The names have several readings so I won't go deeper for the time being...
* The helmet might be older. It would be nice to have some more pictures (front-, side-, back- and top-view) as also some shots from inside, if the liner (ukebari) allows it?!