what does it mean "A conventional evening dress is worn in most instances, save where a ruff or frill is added to heighten the effect of the headgear." any answer would be appreciated.
closed as off-topic by Edwin Ashworth, JJJ, JMP, Cascabel, Nigel J Jun 28 '18 at 12:41
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The usual type of clothing worn in the situation or context described is "conventional evening dress" - except when ruffs or frills are added to emphasise the headgear (tiara, hat, etc...).