Thats a good, point, I doubt I'll ever need to make clothes even though I could. But I have needed to repair clothes. I don't carry reams of cloth or even patches with me in the field. But I do carry denim stuff sacks which could decompose pretty easily into patches. And unlike ready made patches they're big enough to cover the whole butt of my pants if I need something that big. Or I can cut one up and make several smaller patches.
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A gentleman should always be able to break his fast in the manner of a gentleman where so ever he may find himself.--Good Omens