Love the outfit, the grey chambray shirt is divine.
I would never think to pair the mint clutch with the grey shirt,
I am not sure it works, but it is maybe just a preference for more of a relationship between the two.
I think a bright color could work, like red but the mint seems a bit too clean of a color.
Just obsessive color freak here, outstanding outfit!
Just looked again and I think it is because the mint is so light in value-makes the bottom half with the white pants slightly too light for the darkness of the shirt. Again, take this with a grain of salt but wanted to add suggestion as you requested.