Hoping on @concernedattorneycosplay thread because well research cosplay-kimono is always my jam :D
To answer some questions in the tags:
Kimetsu no Yaiba takes place during Taisho era. And I was super please to 1) see this era pictured, 2) see it quite well done fashion wise! Most of the characters‘ attires are pretty spot on for the time (if only with minor artistic liberties here and there).
Taisho era was the time where Japan opened to the West, trying to catch on with Western way of life - hence the mixing of traditional Japanese fashion and Western ones, especially in cities. Tamayo and Yushiro are a great example, as she wears what I believe could be a fashionable meisen kimono with tsubaki (camellia) pattern, while he is dressed in Shosei style (hakama+kimono worn with western shirt):
The vest Nezuko wears above is a nagabaori (knee long haori). During Taisho era, garment like haori and kimono tended to be longer than nowadays (especially sleeves which were longer than modern ones).
Nezuko’s family is indeed pretty poor as they make a living as sumiyaki (charcoal makers). Tanjiro is actually seen delivering charcoal around and his name bears the kanji for charcoal (炭). (I touched on charcoal burners symbolism in a past folk tale if you are interested learning more ^^)
She and here family would have not been able to afford silk everyday wear (silk was spreading among the population thanks to silk mills mechanisation but still expensive and fragile). Her kimono could be made from hemp or cotton, but seing the cold place they live in, is probably wool. Wool is actually super confortable in winter and summer alike, and was pretty wide spread during Taisho era :)
Nezuko kimono is patterned with asanoha (hemp leaf), a well loved auspicous pattern symbolizing wish for good health free from evil as this plant grows quick and strong.
The way her bottom hems fold up make me think her kimono is tuck up a little bit in the back, under her obi belt. Raising hem like this is called shirihashori, and is today mostly seen on men. In the past it was used by workers and travelers of both sex (pic from):
Don’t hesitate to send me questions, this anime was truly a good surprise for me kimono-fashion-wise (the patterns! I have so much to say about the patterns xD)
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