Adding a ribbon to your hair is such a simple and cheap idea but it looks beautiful. One of my favourite places to pick up ribbons and trims is VV Rouleaux in Marylebone, they have an amazing array of trims and fabrics which you can incorporate into different aspects such as your flower bouquet or order of service.
Not the tiara/princess kind, instead, think more along the lines of Valentino & Dolce and Gabbanna inspired styles. I have found a few similar options below. Hermione de Paula also makes amazing customised head pieces and crowns.
Nothing beats a beautiful flower crown or circlet. I prefer something more delicate but really anything with flowers looks good to me.
Image Credits: Rachel Hayton, Cabbages & Roses, Pinterest.