George, i agree. I really don't see people after a collapse of civilization looking like they just left a S&M Punk Bar - once all the pre-collapse clothes are gone.
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After that, i guess is would be about the climate and what you have on hand to work with.
if you look at earlier clothing styles (China, Mesopotamia, Gallic Celts, polynesians) when things break down you would end up with simpler clothing shapes.
pants require alot of engineering just for a zipper - so you devolve back to buttons. sewing and cutting fabric is time consuming and requires tools you may not have. So you go back to a wrap (a kilt or a skirt) its all about how form fitting and comfortable you can make clothes with what you have.
after a generation or two, when the pre-collapse clothes are gone, you are left with fiber - silk, wool, hemp, flax, cotton, banana, coir, mulberry - there are fibers in most places that will serve.
the weaves will either be simple loom or hand woven (meaning a larger, coarser weave) no more 400 thread count fabrics for a while. The cuts would be simpler. the colors earth toned, or natural (dying makes cotton last longer - UV protection) the shapes less form fitting. I think the great kilt, toga, sarong, lavalava would be common.
leather would be rare IMHO. it works in some roles but is prone to rotting when damp and gets brittle in dry climates. Oil tanned leather is hard to make at home. so tannic acid vegetable and brain tanning would likely be the most common methods. JM mentioned its warmth when cold. I can only think of a couple of traditional leather clothes. Native Americans and Alpine Europeans come to mind. I think it will have a place but mostly found on hands head and feet. (unless needed for armor like curboulli).
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i do think that head coverings will make a comeback - people spending more time outside will want protection from wind, sand, rain, cold, heat, etc.
after trade restarts you would have more uniformity - it would be interesting to see the regional differences.
how do you see leather being used?
interesting topic, thanks for posting it.