If you order a seccond strap and have it custom cut short so that the bag fits right under the arm or on the fore arm it looks very chic for going out I love this look and at one point H even made a mini version I Epsom for this purpose with both long and short starp options hope it helps darling!!!!! Best .birkel.
I think it's pretty casual, but you can substitute the strap with a scarf and see how it looks.
The evelyne messenger style seems to be just a casual everyday bag. Are there ways of using it for an evening night out with friends?