Just got my shipment today. I got the blue silk bustier, and the bustier dresses in both sizes.
The dresses run true to size, I would say. (My bodytype is similar to a pole, I'm not curvy.) My chest size is 30", and my waist size is 27" and the size 1 fits me perfectly.
The bustiers are definitely a bit tight. The XS fits, but it's a little bit tight around my waist. The small is a bit loose around my bust, but feels better around the my waist. Arrgh. If I go with the small, it will be easy to layer with things, but I won't be able to wear it alone. If I go with the XS, I can wear it alone, but I won't be able to layer it with other items! How frustrating!