Klumpen0815: Although I'm a Bloßfechter (Langes Messer und Langes Schwert) and no Harnischfechter, I have to say that decent armor always catches my attention.
Even the horse got plating.
Full barding is awesome, here are two very fancy examples I saw at museums. The armor of the rider on the left belonged to Emperor Maximilian I., the horse armor to his daddy Emperor Friedrich III.
I've never had the pleasure of trying Harnischfechten, either, but I've taken part in one Blossfechten training session and one Schaukampf training with the medieval society of another city. They train on a soccer field every week, it's a lot of fun. I thought Schaukampf was very interesting as well because it 's based on doing the exact opposite of what you do in Blossfechten, meaning everything in stage fighting has to be telegraphed.
Sadly, there is no group in my area so I currently have no opportunity to pursue these activities any further but having even a very modest understanding already helps when drawing and painting related stuff. Ideally, I'd like to learn a little bit about everything that's interesting in this world.
(PS: still not in, just sharing pictures)