what does simon were on his face?

He wears glasses, like Jeanette, (his counterpart) in the Chipmunk adventure his glasses are blue, but later like in the Chipmunks meet Frankenstein or The Wolfman, he wears black, he also wears black in early episodes of "The Alvin Show" and the Chipmunks 80s cartoon in the 2007 movie and the "Squeakquel" his glasses are notably black as well, but yes, in short he wears glasses, ANYONE can see that...