This is a flirty late 50's early 60's dress with a lovely draped high neckline and a full skirt. 

The blue chiffon has a floral pattern with amazing touches of white and lavender. 

There's no size tag, but I'd call it an XS with a chest 30" and waist 24." 

I wish I could fit into this lovely dress, but I just don't see that happening and I can't bear for it to languish in a drawer.

I'm happy to answer questions or provide additional images.
Thank you!