Out of order?

This Bridesmaids story is going to span 25 years, starting in 1981. I am thinking of having the first section of the book be the second wedding, taking place in 1987. Then backtrack to the first wedding. Then the third and fourth. This way the story starts with a portait of the way this women have changed since college and the tension between them because of it. Instead of all the happy gooey feelings of when they are in college and pledging to be BFFs forever. Sound like a good idea or too confusing?