On the Knights of Noromath server, we require players to spend a number of rounds donning their armor based on the weight category of the armor. While donning armor, a character has a considerable penalty to their armor class.
Clothing/Robe = No donning time.
Light Armor = 1 round donning time.
Medium Armor = 2 rounds donning time.
Heavy Armor = 4 rounds donning time.
In addition to the time it takes to don armor, there is a slight movement penalty for wearing heavier armor. This movement penalty can be removed by freedom of movement spells or effects, but the donning time cannot be affected.