It never made sense to me that a full body robe for use by the magically minded would actually penalise you on enchantment effects.
For example trousers / skirt, shirt, sometimes gloves and boots as well each with a single good enchantment, vs one robe with a single enchantment.
This is what made me green and orcy.
I realise it was set up for player / game "Balance", but a mages outfit ending up potentially less magical than the gear you start the game with was silly imo.
Hopefully enchantment in Skyrim is overhauled allowing single piece outfits to have several effects enchanted on them.
Off the top of my hat each piece of equipment could have slots or a point limit to how powerful the combined effects can get.
Thus a shirt, skirt, pair of boots may have one slot or X amount of points, enough for a medium enchantment.
A robe would have three and Y amount of points.