Yup - I am another who does not change children's clothes for home time - being 'dirty' is my 'what I did today' sheet for my clients' see we had pasta for lunch, explored goop, had a little science with mixing sand and water to make mud' and so forth being dirty is a sign that we had FUN today

I will change them if they are WET from play or meal time and uncomfortable as a result and sometimes if a parent has specifically sent 'extras' with a 'we are going out to dinner so can you keep this set aside for end of the day so it does not get dirty' and even than I will have the set of clothes and a cloth all ready at pick up time for the PARENT to change and wash their child up to head out for dinner - unless they are the LAST kid here and than I will help them out just to ensure they are out of here quickly

Personally the less 'laundry' a parent has to do the better ... why wash 4 barely dirty outfits cause you changed them after every meal or what not when you can spot wash as you go and than the parent only has to wash one REALLY dirty one at the end of the day?