Here is an interesting illustration of Skeletor from the 1987 UK Masters of the Universe annual. This annual was the first to heavily acknowledge the Filmation series, with its, at times, ridiculous use of Filmation model sheet poses. Interestingly, in this illustration, the artist has decided to give Skeletor a cape. And whilst that is not a bad idea, I think it is fair to say that the cape is a little on the short side. The cape is actually the same length as the one sported by She-Ra!
(click on the image to see it at full-size)