How much might one dandy lad be asked to pay for a fascinator for a fashionable miss?

I am off to the ponies this November and my lady absolutely must look her best. Only the finest of finery, and most fascinating fascinator is to be perched on her head. How many of Daddy's dubloons will I need to auction to make her the belle of the ball?
Update: Golly ladies, why do y'all assume it is for the sex? I really just want to know what folks spend on those fascinators?
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