Very interesting suggestion by Stephen Adams (below).
Have we forgotten that casque means literally and primarily
a helmet?  In which case, "The green casque has outdone your elegance"
is a line filled with bitter irony.  The negative Order represented
by the army's kind of fashion statement and the army's typically
rigid, mechanical, insect-like movements (marching, saluting, etc.)
have for the moment stolen the show.

==Dan

>>         Pull down thy vanity,
>>                                          Paquin pull down!
>>         The green casque has outdone your elegance.
>>
>> When has the army ever been interested in the concept of _elegance_ except
>> perhaps with regard to the efficient lethalness of a new weapon?
>
>Could "the green casque" be a GI's helmet?
>
>--
>Stephen Adams
>Department of English
>University of Western Ontario
>London, Canada  N6A-3K7
>(519)-434-7519
>
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