Rustley, I like that new word! Like the taffeta slips when we were little, right? I think those shirts may have been the pampered ones htat got to go to the laundry instead of getting washed at home. Check for names written inside the placket at the bottom- that's the clue that they went to the laundry.
Pardon any typos. I can't go back and edit anything- I have some kind of scrolling disfunction in my laptop and it makes the cursor zoom along to the end of.... everything. Massively annoying.