For young Igor, to keep his tools handy when he’s working in Dad’s Mad Lab.
[I made the mistake of telling him, in an attempt to lure him from his much-too-late-in-the-day nap, that I’d made him a present. His reply, loosely translated: “You call this a present?!” My bad. But he’s wearing it in this shot, taken an hour later, so I guess it was OK after all.]