Preferably under your trousers.
& not back to front Donkeys ago there was some thread about UKP'ers nearly being caught - boxers back to front - t-shirts inside out [& back to front / both]- shirts done up with the buttons misaligned
It never happens for me these days but it's quite nice on the flip to discover that the SP has managed to lose her underwear too...
From just £36 per year