Land, if you look at the front right kilts in the image, you can see there is a distortion of the black lines of the right top. That is a bit exaggerated due to the hanging concurring at the time of the image itself, but over time that will happen permanently. Any distortion in the weave will eventually effect the pleats and aprons.

For those who want to use the "tube method" of plaid storage and also want to use cedar for it's antivermin properties:

If you have a table router set up, if you use a large round over bit and a 3"x3" length of cedar (cut a board you can get them at your local lumber yard), you can make a dowel by using the bit to cut the corners of the wood off, just make sure you leave about an inch on each end of all the sides to keep it solid on your table (depending on the size of your bit it can be a circle or a rounded square) and sand it. For a good sized (read solid enough and long enough) cedar dowel, I found this to be much less expensive than buying one (if you can find one...). Just remember, to lightly sand the dowel occasionally (one a year or two) to keep it working.

For a less stable/permanent, easier way, prick holes in the cardboard tube with a tack (if the tube is heavy enough, you can use a very small drill bit). Tape up one end, toss some cedar shavings in the tube, then tape the other end (if you use a heavy mailer tube, they come with those nice plastic ends and you don't have to tape the one end, so it's easy to change out the shavings when you need to.)

My mom used these methods for some of the captured battle flags at the Mighty Eighth Air Force Museum when she was doing an archivist internship (she set up the cardboard, while I made her the dowels and a rack for them).