For the most part, the wizards in my saga would not look much different from some other class of person.
Lady Pellegrina of Jerbiton wears the clothing of a noble woman, with a small cloak of ravens feathers tucked up one sleeve of her voluminous dress.
Coraldo aka Laurus Dionysus is accustomed to wearing the clothing of a merchant, as his family's trade is of the mercantile sort, and he's a bit of a hedonist.
Renoir wears working clothes, as he dabbles in blacksmithing when not working Terram in the lab. When out and about, he often wears armor.
The one example that does touch upon the robe issue is Helios Excelcis of Guernicus, who learned a great deal in the University of Paris before becoming a wizard. He was prone to wearing the robes of scholar, and often made his way about posing as such. After a few abuses at the hands of fate, and some changes in his person attitude towards what it means to be a wizard, he did commission robes of a more hermetic sort, decorated with astrological symbols and so on.
Generally, this is his 'biker jacket' when among villagers who know of him, or to whom his reputation has spread (post Festival of the Damned, wherein his casting of Demon's Eternal Oblivion saved a number of people). He tends to wear these clothes when he wants to broadcast "Do Not Mess With Me, I Am A Wizard". If he actually wants to go to market, or get a room for the night, he tends to wear more subdued wear.
Now, indeed, he does not expect to be shown a lot of kindness in his awesome red and yellow wizardly robe, but he also expects people to get out of his way. Once he pops a few demons or otherwise does some good, feelings tend to slowly thaw as he builds a positive reputation, often aided by words from companions, a minstrel of the covenant, and so on. Usually, he's not around long enough for this to happen, as he's either zapped the demon or burned with fire the issue before him.
Initially, when the wizards were weaker, they tended to hide their true nature, but as they began to grow in power and chafe against the limits of going incognito, we moved away from the "Vampire the Requiem" model and the wizards began to not hide who they were. OF course, by this time they had saved the local village of Vezay from various problems and solved a fair number of mysteries and so have a positive rep to smooth things over with the locals in spite of the Gift. They're not sung of as heroes, but the locals are increasingly grateful for their help...