Between the days of the Old Republic and Attack of the Clones, Mandalorian armor changed drastically. Here is what Mandalorians looked like in their old armor:
Here is what Mandalorian armor looks like now:
While I understand that armor may change over time, every Mandalorian save Mandalore himself wore the same kind of armor, so that armor must have become pretty important to their culture. This is what Mandalore looked like, you'll notice it's pretty similar to the modern armor but still quite a bit different:
I'm wondering if there was a particular reason why they changed armor, or if it's just something that quietly changed over time.
In canon, I don't think the old armor even existed, so I'm expecting answers to draw upon Legends. That being said, if there is something from canon that answers it, that would be a surprise to be sure, but a welcome one.