What about the armour upgrading feature in M2TW? You build the requisite building to upgrade the units defence stat, but it also changed their equipment. For example, a unit of levy spearmen started off with no armour, but if you built a tanner you could retrain or recruit new levy spearmen with leather armour and with a blacksmith you could give them chainmail, as apposed to RTW where it only upgrades their defense stats.
A unit of levy hoplites for example could start off with no armour, but with a bronze shield could be upgraded with leather or a linthorax or something similiar, where as a unit of proper hoplites would start with a linthorax and get something slightly heavier.
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