In my experience, I have always sent Rehearsal Reports to all major production staff including Director, AD, TD, ASMs, Props master, all designers, master elec, lead carp, etc. It may vary from production to production, but that's generally how I do it.
I don't think you were at all out of line to make the costume and props folks aware of the issue. It is much better for all parties to be aware of an issue before people waste valuable time and energy on props or costumes that will have to be altered once the problem is seen during a rehearsal.
If this had been me, I would have put the note in the report under the costumes AND props section, and it would be sent out the night of rehearsal. If I had a few minutes the next day, I would go to the costume designer and props master in person to double check that they understood what I meant and taking note of any problems that they might have fulfilling those requirements. I would then reconnect with the director at rehearsal or before to inform them that I have addressed the concern and where the other departments stand on a solution.