"Sister In Law thinks Kilts are not acceptable everyday attire."
That is a perfectly valid feeling and you should be supportive of your sister's choice. If she only wishes to wear a kilt only on special occasions that is her perrogative. I, for one, respect that. 
Cheers
Jamie
-See it there, a white plume
Over the battle - A diamond in the ash
Of the ultimate combustion-My panache
Edmond Rostand
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