I don't know...Jesus kind of needs the robes. Without them he's just another long-haired hippie babbling about peace and love and looking for a drum circle. Superman is in a similar situation. With the tights and cape he's our savior. Without them he's just a newspaper dork.
I don't know about robes, but he certainly can't be taken seriously without the holes in his hands.
Crown of thorns is a bit melodramatic though. I think someone just made that shit up later to make Jesus sound more hardcore. Totally not necessary. Anyone nailed to a plank of wood is pretty hardcore, in my book.
For years and years I've studied countless religions, read the bible forward and backward in 6 different languages and talked to any respected religious figure I could get a meeting with to seek this valuable information that has plagued my existence.