Glorious Cardigans

My closet is filled with a wonderful rainbow array of summer dresses. The trouble is that most cannot be worn to work because of their thin straps. How do we fix this problem? Shop for fabulous cardigans! 

 Of course I'm quite certain that when they arrive I will have mistakenly chosen colors that do not match with anything I currently own. 
Such is the way of the vicious shopping cycle.