Imp gear in Skyrim is largely based off of ancient Rome, but there are some significant differences, some rather significant differences. While legion armor imitates Lorica Segmentata closely enough unless you want to cherrypick one really big problem is the shield, it may be said that Roman empire could never exist without Scutum, it′s absolutely integral to the roman military strategy, it covers most of the body, it′s curved so it provides cover from multiple directions (unlike barbarian shields which were straight) and legionaries often used them to brace against the charge, also when attacking a legionary would hold his shield in front and push the enemy while stabbing with his gladius, leaving him very little opportunity to recover, those diamond shaped things Skyrim legions carry would absolutely not cut it, they are far to small for use with an armor so exposed, and when we are on topic of gladius imperial sword, while following same curves is much too bulky and large to be used as stabbing sword, gladius is meant to be quick and agile so the enemy has a hard time defending, imperial sword is clearly meant to be used as regular medieval sword. and there is one more piece of vital equipment romans had that imperials don′t. pila, it was used by romans to break up enemy formations and disable shields, of course imperials seem to have a tactical range of "rush it till it dies" but this is about gear, generally it seems imperials rely on weight of numbers to win rather than good gear and discipline which was what romans historically used since they were almost always outnumbered.