The most popular size for a Bridal Bouquet is a 12″ Wide Hand Tied. But 11″ or 10″ make great Bridal Bouquet sizes as well. For a small, intimate Wedding, you could also order a 9″ Wide Bouquet. For a Cascading Design, the most popular is the “Full & Elegant”.
For Bridesmaids the most popular size is 7″ or 8″ Wide, and usually 9″ Wide for MoH.
But there is no rule here, just what you like best!