I am also pro choice, so I also would like to see variations in clothes.
But to answer her question�
If a wizard would really wear a bathrobe instead of a robe then I would wonder if he is maybe some exhibitionist of some sort.
Robes are actually quite comfy and attracts less attention then the noise �clink-clank� of a metal armor. And in most fantasy games/worlds it is also not recommended to wear at least metal armors if you like to toss electrifying spells around as misfire always happen.
Besides�
In case your spells misfire you can much easier tear those burning robes of your body then a leather armor or other, normal clothes and in case you upset a mob of farmers because your fireball created accidentally an undesired barbeque with their livestock then it is much easier to gather up your robe, take your legs into your hands and run for your life as your trusty full armored buddies take all the blame..eh..beating�eh�responsibility of your unfortunate spell fumble.
Serious, I would also like to see more variety in dress code as long they don�t go the same way like in MMO games where all characters get more and more, as higher they get level-wise, dressed into more and more flamboyant outfits to let them look like they work in a guild of easy virtues instead for a mage guild.
With that MMO logic less armor would mean more protection which let me wonder why folks in those games do not around naked to be invulnerable.
Still�I am pro choice. So if some folks like it they should have the option for their hooker outfits as long the standard looks more like average dressed folks in the game world.
How about if fresh wizards dress in normal clothes and have to �earn their stripes� first before a mage guild allows them to wear robes, pointy hat and two-handed staff to show their distinctive services as mage? It would make a bit sense why the big experienced clich� wizards wear a more representative outfit if they desire to do so or lend still in with the crowd by wearing something more fashionable up to Leather armor as long they don�t cast element spells and use any weapon they like as long they learned the skill for it.