How should I word a formal invitation to a tea party I am throwing for my neices in my garden?

Question

There is a dress code. Hats are required for the "ladies" and a bow tie is required for my nephews.

Answer 1

Your presence is requested at a formal tea party, please don your best hats for the ladies and ties for the gentlemen.

I would like to request your presence at a formal garden tea party.  Please wear your best dresses and formal wear.

Answer 2

You are cordially invited for tea in the garden.

time

date

place

Regrets only 555-5555

Ladies please don your best hats, and gentlemen, ties are appreciated.

Answer 3

here's an example:

   "Mr. and Mrs. Smith cordially extend an invitation to you

       to a tea party hosted by (your daughters name).

       The party will be held at (your address) on the 9th day

                                    of May at 2pm.

                            Please RSVP by May 2nd."