A women I had worked with at another library emailed me this question:
...Have you got a pattern for a whistle cozy? ...I need one. And saw your dice pattern on ravelry...so... Got one?
She's referring to a pattern I created to knit a set of Yahtzee die for my brother. That actually wasn't far off from a whistle, but without getting myself a whistle and figuring it out, I had no idea how to modify the pattern to accommodate it.
So, I hoped I could find one online. But when I searched for "knit whistle cozy" (and variations), I kept getting patterns for cozys for penny whistles:
That pattern is basically a thin sock (with no foot), so it shouldn't be too hard to make. However, when she said "whistle," I was thinking more of a referee whistle - and now I wasn't sure what she wanted.
So, before I emailed her back, I kept looking to see if I could find a referee whistle cozy. I searched through Ravelry, a lot of other websites, and checked the index of all the library's knitting books, but I couldn't find one.
However, I did find something close (if you sort of squint your eyes and hold your tongue just right) - a pattern for an asthma inhaler sock.
That seemed shaped more or less like a whistle (and as the creator also noted, more or less like a small foot), so again the pattern is more or less a very small sock pattern. And the best part is that she came up with the pattern herself.
I wasn't sure if either of these patterns would help my friend though, so I put them both into an email, said I wasn't sure about the penny whistle/referee whistle thing, and sent it off.
Shortly thereafter, she wrote back to say it was indeed a referee whistle she was talking about. It turns out a friend of hers is a security guard, who could use something to keep the duty whistle warm and clean. Awesome.
The success of this answer really depends on my friends knitting skills, but hopefully one of these will work. If I were to try it, I think I might just go with the dice pattern and put a little spout on one end - but thankfully, I don't have to. Good luck, E.