Sashes

[hrhcp]

And how come they have different colours ?
I have been reliably informed that they are called "sashes".
Now, at King Carl Gustav's 50-th birthday, I see on a lot of the pictures on LTR that the out of country royals wear light blue sashes, and Princess Caroline elects to wear a red-white-red sash.

My question ... are there certain rules of what the out of country royals wear?
And I have also noticed that the princes at times wear their sash almost horizontally over their tummy and not over their shoulder, and wonder what the significance of this is?

The most common appear to be light blue and purple.
And then there are national colours - Norway has a nice edge to theirs. Monaco also has more than one colour.

I don't remember if the Swedish RF has muli-colour ... shouldn't there be an acknowledgement of the national colours?