I think you guys are the ones who are irrational. How are young children, who barely ever sweat, supposed to get their clothes dirty in bed at night -- or wear them out?
I do change kids' clothes if they're dirty, but often the clothes truly do need days to get dirty (I am very fastidious about cleaning bottoms, mind). The worst I would say about our habits is the kids' clothes are sometimes wrinkled, but they would be anyway since I can't be bothered and DH only irons his own clothes.
I don't (usually) wear day clothes to bed myself (well, ok, sometimes I do).
Now, I'll go one better. For life of me I can't understand why most people insist on a shower in the morning. If I have one (gasp, not every day), it's at night time. Who wants to go to bed all smelly? Sounds disgusting.
I get the impression that a lot of people sweat a lot at night so need the morning shower. But I don't; if I get too hot in bed I get nightmares, so I don't run the risk of getting too hot. Or maybe I would take showers in the morning, too.
Yes, I go to great lengths to avoid arguments. We get tantrums from DS and fussing from DD most days over so many issues. Minimising the clothes debates is worth it. Sign me up for Wimps Anonymous, then.
Oh well, glad I brought some amusement to Mumsnet today!