So, here is the matching dress to the pale yellow hat and I think they make a great pair.
I found some toddler's shoes on line that are the same yellow, with a pink flower, some cream accents. I may change the ribbon on the hat, add a flower or two on the dress...and WOW! A matching set!
I could buy various ribbons and make matching flowers that can be changed so the dress will change looks for different occasions. Another idea is to buy tights to match the accessories.