Sleeve
A mix of spirit and reason helped you invent the sleeve. Your spirit told you your arms were uncomfortable, stuck to your sides under that shirt. Reason told you that maybe, just maybe, if you made holes for your arms something good would come out of it. And that's how sleeves were born!
しゅう
そで
None
And without these sleeves, your arms would be so dead (そで). They'd be all exposed and defenseless!