"Rules" for dressing up

[fluter]

This is not something I know anything about. Is it just the jacket that changes with the time of day, or is it the entire ensemble? By the rules, that is.
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I think daytime formal (morning dress) and possibly semi-formal uses striped gray trousers. Some of the links in the wikipedia.org article are very informative.

The morning dress article addresses a question that I had---namely, what's the kilted equivalent? Can anyone vouch for its accuracy?

It indicates that my charcoal grey jacket and vest would serve for morning formal, with appropriate tie and hose... That'd be nice, since I don't have a black jacket!