THIS WILL BE MY FIRST TIME ORDERING BUT NOT SURE HOW TO GO ABOUT ORDERING FOR MY SIZE I AM 5'6 I AM A BUST SIZE 36C BUT HAVE A FLAT TUMMMY AND CAN FIT INTO A SIZE SMALL TOP IF MATERIAL IS STRETCHY I AM I AM GUESSING LIKE 3-4 IN PANTS BUT I HAVE LITTLE BIT OF HIPS AND A BUTT NOT SURE WHAT SIZE TO ORDER PLEASE HELP I LOVE THIS DRESS AND WANT IT