Just out of curiousity, why the pointy hat in the first place? Sure, I know that wizard=pointy hat, but, where did that come from?
I could live with pointy-hat wizard as an iconic. Would be better than Buckles McBuckleton the sorcerer in 3e.

Although, thinking about it, I wonder if it's iconic or cliche. It rather has been done to death.
I believe it was the case that the pointy hat supposedly focused the wizard's mental power - somewhat like a magical lightning rod to the wizard's brain.
Close. Yes. The image of the conical pointy hat of witches and wizards was a nod to (or limited understanding of) the ceremonial magicians of old and their process of "raising power" within a sanctified "magic" circle. Within that circle (the base of the hat) you then raised a "cone of power" that was then the energiy used to direct toward whatever purpose your spell/ritual was supposed to bring about.
The stars and moons, I believe, came about due to the general use of astrology and understanding of astronomy along which lines, one's ability to raise power (and how much) was viewed as dependent.
Personally, MUs are my favorite class. always have been and I've played plenty. Never did I dress one in a pointy hat and I am afraid, as Dasuul mentions above, they have crossed the line from "iconic/symbolic" to "clicheed."
I like the brimmed floppy pointed hats of Gandalf and/or along the lines ofthe "Sorting Hat" in the HP movies. And think that is an image that might be more familiar and acceptable in style tto today's audience...while still being a nod/hommage to the "traditional//ceremonial" brimless, straight up, pointy hat.
Back in the original Against the Giants, every image of a "magic-user" in the interior art involved an old bearded man in a pointy hat...and yes, it made it readily understandable/interpretable that if that other guy in robes wasn't wearing a pointy hat, he must be a cleric/priest...but I still thought it was hokey...even back then.
I do not think, speaking for myself, I would care to see "iconic" characters portrayed as such. Maybe an eccentric NPC, a court astologer or circus/carnival magician or the occasional background figure in a crowd street/tavern/court, would be fine. But not as an "every wizard you meet is gonna be wearing this"...especially if they are not in the process of spellcasting.
In my own homebrew world of Orea, I have a nation of magic-usrs/mages. There is a fashion, for formal occasions, that I depict the well-to-do wizards of the noble houses and courts wearing various pointy hats (the higher and more outrageously adorned, the more "fashionable") but it is a throughback cultural thing...not an everyday fashion...like tuxedos are today...a special/formal fashion that noone really questions or knows why they do it...nor has any special power/meaning other than to be "formal."
A singular magic item of a pointy hat with stars and moons and planets on it, that shift and change to reflect the position of the stars and moons in the sky/immediate area of the wizard, lending some kind of bonus or enhancement to their spellcasting, or that when certain constellations form upon the hat give the mage some added power (shapeshifting into a centaur archer or a giant warrior with a club...a hippocampus to breathe underwater, etc...), would be exceptionally cool, I think...but not something one would wear all of the time.
Just my two pointy coppers.
--SD