I'm pretty sure she will wear a tiara. Junior member of the family, Autumn, wears one. It's impossible for kate not to wear one. Flowers ? maybe for the evening reception a beautiful chignon with some flowers? but not in the Abbaye. The wedding is "nearly" a state affaire. 50 heads of state, the whole house of parliament and MP's, former primes ministers (M. Tatcher, Blair, etc...), Governors and leaders of political parties, two reception in a day, all religious dignitaries, on this scale it's pretty evident she will borrow a tiara from the queen or the queen mother (via the prince of wales). And remember in the Telegraph an article about a hairdresser (not Richard Ward, Kate'Hairdresser) but the one of Kate Moss, a concurrent (a rival), who said he regrets the decision of Kate's hairdresser to comb her hair up for the tiara, and taht she be more beautiful with her hair down with it? Flowers is maybe good for a minor member of the family but as Prince Harry said "William being who he is...". I pray for a tiara. Just 3 weeks and ... TATA ...