There was a previous thread on this some time back (I tried to find it, but failed).
One suggestion was to keep the kilts in a deep-freeze!
There are also bags sold that are air-tight, and have a fitting that lets a vacuum cleaner suck most of the air out of them. That might also be a good idea, after you have thoroughly brushed and steamed the kilt.
No way is cold going to damage the kilt!













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