Aliens

Why is it that our depiction of aliens never includes clothes? I have never seen an artist's rendition of what aliens might look like that includes clothing. Could this be a reflection of our own opinions of humans? Are aliens supposed to be so intellectually advanced that they no longer have "shame" and therefore don't need clothes? Or is clothing just something that we assume to be human-exclusive? No other creatures on Earth have the need to clothe themselves. Think about it, clothing has become such a part of our species that our evolution has been altered by it. Once upon a time, I'm sure that we were a much more furry species, but over time we have invented clothing so that we don't really need the fur anymore. Wow, I'm so deep......LOL