Hey! I have that top - well, a teal blue one I bought from Arden B several months ago and just wore it the other day, but mine is not linen (I hate it that they wrinkle easily so I stick to the pants and capris only) but silk, so it works well in a hot/warm weather.
http://www.ardenb.com/
I say - take the cc and play dumb when you spot the Dior shop, LOL.