Last year I was on a 19 day highlights of China group tour.
One of the men on the tour wore the same kind of blue lightweight shirt every single day!
I hope he had brought a few different shirts and changed shirts every night . . . . . but I wasn’t going to stand next to him to find out.
I usually travel fairly light so I only have a few shirts and wash after each days wear, but they are all different so it is obvious I am changing shirts daily.
What has a fellow traveller done that you thought odd?