My 4-year old recently started kindergarten and has to wear a school uniform. I tried to prepare her as much as I could over the summer about having to wear it for school. Thankfully we haven’t encountered any major issues in the morning when she has to put it on.
A couple of weeks ago however, we found out that the kids are going to be doing Judo once a week, and last week they were given their Judo uniforms, and the parents were asked to send the kids to school every Wed in the Judo uniform and pack their school uniform in the backpacks. Again, we talked about it, tried it on, and she seemed to be fine with the idea.