That is why I am thrilled to have found an invention which helps enable my costume hoarding by creating more space to store them: The Space Bag (or imitations of the original - I am cheap and not that picky). I am not trying to make any sort of publicity for them, but see by yourself ow wonderfully useful they are.
Take four 18th century outfits:
Not only are your costumes safe from the cat, as well as potential water damage or clothing moth attacks, but you also have more space to store more costumes! Now I ask you is that one of the best inventions or what! Excuse me while I go tackle the Medieval costumes in the same way.