Missing T-Shirt

It's stunning how frustrating something as trivial and insignificant as having seemingly lost a t-shirt can be.  It's not even a great t-shirt - one I got from work a few years ago.  But I have absolutely no idea what I've done with it - accidentally thrown it away, left it in a hotel room or similar, got lost when moving house, whatever.  But it's really doing my nut in - and I can't stop myself from constantly going through my stuff hoping I've just mislaid it somewhere and I'll chance upon it.  And looking for it in the middle of the night.  Not healthy behavior.  But I'm pretty sure it has gone.  Boo.