I have recently discovered a glitch in the PC version of Mass Effect that, just like the XBox 360 glitch, allows you to equip any armor on any character.
First, you need to have the suit of armor you want at the top of the armor list.
Next, you need to equip a mod to your current armor and rapidally double click equip.
You should have the new armor equipped on your character regardless of whether or not you have the proper or any armor training at all.
If you have any futher questions please ask.