I've thought of it but haven't tried it for more than some months because I really don't have anything I wear frequently enough that I could use for this effect unfortunately. It's a bit similar to the idea of a dream totem, I think. For some time I did wear a bone-like bracelet/bangle and kept my mind on it in that case, but it never carried over into dreaming. Same with watches, glasses.

But one thing I find interesting is that, from my experience, this type of thing is very similar to how you can memorise something and then knot/twist a couple of your fingers together, and then keep the memory tied to that physical sensation. It can work particularly well to keep a passing thought in mind if you're having to go through a lot of thresholds, since typically many thoughts get lost as you cross physical thresholds.

Unfortunately, I don't think these things work very well for me as a tool to lucidity because of the way my dreams seem to select what the dreams are about. Besides that, my form in dreams is usually abstracted and the sense of a whole body doesn't exist in the same as waking reality for myself. That, and physical sensation is often very vague for me too, so that may be why this type of thing doesn't work well for me. The only thing I do sometimes find with myself in dreams is my phone, but it's not common and it only ever seems to be for dream-plot purposes - I can never feel that it had been there all along or anything like that.