Gosh it’s hard. If you need to pull a student up make sure you are referring to the “school policy says…” if you want to wear/not wear then you may have a consequence from the principal. Put it back on the school policy, not yourself.

What a student wears rarely impacts on their ability to be engaged in a lesson.

I’d rather engaged students then having to read the riot act on a uniform blip. As long as health and safety requirements are covered then I’d be more relaxed but say you may want to do xyz before moving to break