This letter/enquiry from last weekend's Sunday Times amused me.
I recently bought a couple of pairs of Summer shorts, and as I always do, I put them directly into the washing machine. I always wash new clothes before I would dream of wearing them.
I took off the price tag, etc, and threw them in the machine as they were. And just as the writer of the letter observed, they emerged 'inside out'; both pairs!
I'm not the type to write Mr Angry, or even Mr Pleasant letters to The Times, but in this case I did offer some pretty obvious advice.
Of course you turn your pants inside out before washing, then if the theory is correct, they should emerge the right way round. Simple.
However, the 'why' question is still something of a mystery.