This armory makes 3 types of traditional Samurai armor.
What armor in the PHB do you believe each one is similar to, or associated with?
Tatami (folding armor, economy armor, footsoldier armor)
"Classic" (better quality footsolider armor?)
Bugyo (officer armor)
Hatamoto (guard armor)
http://www.ironmountainarmory.com/our-armor.html
Would you classify any of these armors as a hybrid?
aka Light/Medium or Medium/Heavy
Thanks in advance!
For a better look at Japanese armor,
Wikipedia actually does a good job. The Iron Mountain Armory armor classifications aren't how Japanese armor are typically classified, causing me a bit of confusion. For instance, for the "classic" armor, they describe the helmet, but not the "dou" (cuirass). Also, the tatami armor would be karuta tatami (there are other types of tatami armor).
Basically, samurai armor can be described in D&D as either scale armor, splint*, or half-plate depending on its dou. Older, typically pre-Sengoku era armors (Kozane dou gusoku) used a lamellar (similar to scale) cuirass. Call it scale armor and be done with it.
Later armors, like the kiritsuke kozane dou, and the even later okegawa dō, forewent the individual scales (kozone) for horizontal lames (sometimes crafted to look like individual scales). These are essentially splint armor (though they used horizontal lames instead of vertical lames).
Later tosei dou (modern armor—post European contact Sengoku and Edo eras) used solid plate cuirasses. Some looked the same as European breastplates, while others were designed mimicked the earlier lamellar or laminar dou. These are pretty much half plate, or plate.
The tatami gusoku (folding armors) are typically fabric, mail, and small, non-interlocking scale plates. I'd just treat them as chainmail.
* Technically, banded or laminar armor, but the 5e armor list decided to leave out banded armor (armor made of horizontal lames—and historically existed in several cultures) while keeping splint armor (armor composed of vertical lames—of questionable historical usage), so we default to splint instead.