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>>What's crazy about E. cap'n? Proper nouns get cap'd: We have seasons - each named is cap'd; we have days - each named is cap'd; points of the compass, months, seasons - generally where you have "sets" of nouns.
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>Would that include pieces of clothes? Or "sets" of furniture? Where is the line drawn?

Hard to say and I've never really thought about it before today. As for sets: think of it (in the above examples) where each member of the set is "on an equal footing"/of the same form as the others. A sofa is nothing like an armoir and sofa is not a proper noun, anyway; it just happens to be what that stick is called. Anyway, who's heard of a set of furniture? When is the set complete? You can have a set of cutlery (silver) or crockery, but each type of item (e.g. cup, saucer) is differerent from the others.

Same goes for clothes.

Days of the year too can be cap'd, e.g. St George's Day, New Years Day.

Come to think of it, unless you can think of some anomolies, this seems to be on e of the rules that English obeys!