Royal Museum of the Armed Forces and of Military History, in Brussels, Belgium. They have a splendid collection of medieval arms and armor that will be the subject of an upcoming post on the Black Gate blog. I'll give you the link when it goes live next week.
The suit on the left was made in Germany in the third quarter of the 16th century, while the one on the right was made in the famous workshop of Michael Witz of Innsbruck around 1555. The helmet in between is also German from the mid-16th century.
Sadly I can't tell you more because the signage was all in French and Dutch. I puzzled out as much as I could and came to the odd discovery that while I studied both French and German many years ago, I had an easier time reading the Dutch because it was close to German and my German was always better than my French!
Oh, and what's that gauntlet on the lower right getting up to?