A new dress

Last Monday, while I was choosing what to wear to have dinner out with bf, I noticed something: I need something light, fleeting, colourful, for my summer nights.

On Tuesday, on the way to San Miniato, I had to stop in Pisa so I couldn't miss a quick jump at Dixie, one of my favourite shops ever.

I like EVERYTHING there, but what caught my eyes was it: the light, fleeting, colourful dress my wardrobe was missing.
One-shoulder, with rouches and paisley patterned:

Now the question is: which shoes? Which bag?
I don't understand why I don't come out with these questions BEFORE buying something new...