I haven't seen an invitation myself, but apparently the foreign royals will wear day-dress. I suspect this means there will be no tiaras other than possibly for the Queen´s ladies. Thus it will be similar to events in Australia, Canada etc when they have had state openings of parliament with only the royal entourage in gowns and tiaras.
I have to say I am not surprised by this - among those attending very few will own formal wear or uniforms, even fewer grand jewels, and a modern dress-code is in line with who is actually invited to attend.
But I am a bit disappointed the reception on the evening before is not a grand gala banquet. The late Queen Elizabeth hosted such a banquet for the Commonwealth leaders not that many years ago, and they could have hosted such a banquet now without embarrassing those attending the actual coronation.
Thank you Torkel. You say "very few will own formal wear or uniform" and I wholeheartedly agree. It's why I live in hope that there were a few different editions of the accompanying information.
333