I am particulary fond of a type of arm defence that we've come to call "disc and splint", which crops up throughout the late Middle Ages. Legolas is wearing a version of that, and a two fingered archer's glove over his jack. (And of course one of those high collared mail shirts I love.) I totally forgot his bracer though, and he must have stowed the quiver somewhere below the ramparts.
Gimli is totally Russian in inspiration, straight out of Alexander Nievsky, all fine chain plate over heavy lining. The shield is Rohirrim of course.