Nobody is wearing shift dresses at the moment! The OP would look dated or look as if she came from the office in a shift dress in London.
I think it's nice, and I looked at it myself, it looks gorgeous on the model, but then I googled further images of this dress and decided it's far too voluminous and tent like to look flattering on anyone who is not 6ft tall or model thin!
I would suggest a midi length dress for afternoon tea in a floaty fabric and wear with sandals or ankle boots.