Mojirisode もじり袖( 捩り袖)'Mock' Sleeve
This type of sleeve is made by folding the bottom up into a triangle. Several surviving working kimono from the Meiji era (first image) have this type of sleeve. Although not as common nowadays, it can still be found on jackets.
Images: Ichiroya, Otokonokimono.Style, Hantenya, Sou-Sou,
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