LOL - You see this site is so educational - I had to look it up to see what a milliner is!
Sorry Helena - I don't know a good milliner - but I hope you do post photos of the event so we can see you in your splendid hat!
So for any other stupid Americans who didn't know (like me) - here is the definition from wiki:
Millinery refers to hats and other articles sold by a milliner to women, or the profession or business of designing, making, or selling hats, dresses, and hat trim to women. Women would ask a milliner to remake their old clothing into new clothing. A milliner is a hatter who designs, makes, sells or trims hats and dresses. Customers would visit a millinery shop to look at and to buy clothes (children's clothing, shirts, undergarments and caps, for example) Millinery, if taken in a more general sense, also means any accoutrements that are functionally unnecessary, such as a garnish on a dish, or the extra cuff-buttons on a man's dress jacket.
Rule No. 1 - If it sounds good - it is good!