I own nothing.
Hisana becomes aware early on during her married years that the man she has married doesn't always pay the greatest amount of attention to his surroundings, namely the weather outside. Byakuya becomes aware early on during his married years that his wife often notices the things he doesn't.
"Byakuya-sama, it's snowing outside."
He's about to leave for another day's work when Hisana lets her voice be heard. Byakuya looks around and there she stands, holding lightweight silk folded over her arms with a determined look on her face. Byakuya nods slightly. "Yes, I know, Hisana."
The expression on Hisana's face is something not usually seen there—a half-life of a smile combined with something very close to exasperation. "It is very cold outside, Byakuya-sama; you need a scarf." She unwinds the pale silk material from her arms and holds it out, revealing it to be a scarf.
Before Byakuya can accept the outstretched scarf, Hisana stands on tiptoe and, having to strain even with her arms stretched out, winds it around his neck. "There," she half-whispers, the exasperation gone from her face and the semi-smile remaining, "much better. Now you won't freeze to death."
Byakuya goes away with the light, tantalizing scent of the perfumed scarf full in his nostrils.
-0-
After that day, Byakuya can't really remember a day in which he doesn't have the scarf on at some point during the day. The silk is well-looked after and never cracks or frays or becomes torn; he wouldn't risk it. Even after the scent has long since faded, it takes no effort at all for Byakuya to recall the smell of the perfume.
He always keeps the scarf with him, long after winter has passed, long after fifty winters, springs, summers and autumns have passed since Hisana's death. It seems the least he can do, to take care of himself as she would have wished.
And it reminds him of her. That's more than good enough reason for him to keep the scarf on for the rest of his life, long after it has frayed, torn and cracked beyond recognition. It was her suggestion, after all.